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<v Speaker 1>Welcome to the Core side Quantum Physics podcast, an exploration

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<v Speaker 1>of the fundamental structure of reality where quantum laws govern matter, energy,

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<v Speaker 1>and information. Here, uncertainty is a feature, not a flaw,

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<v Speaker 1>and understanding begins at the smallest scales.

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<v Speaker 2>I want you to imagine something for a second. Imagine

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<v Speaker 2>you're walking into a university physics lab. You walk past

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<v Speaker 2>all the high tech equipment, you go over the professor's bookshelf,

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<v Speaker 2>and you pull down a foundational one hundred and fifty

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<v Speaker 2>year old textbook on how materials work, and you just

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<v Speaker 2>toss it right out the window. Because essentially that is

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<v Speaker 2>what just happened in the world of quantum physics.

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<v Speaker 3>It really is. I mean, shattered is really the only

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<v Speaker 3>word for it. We are looking at a breakthrough from

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<v Speaker 3>April twenty twenty six, and this was spearheaded by researchers

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<v Speaker 3>at the Indian Institute of Science in Bengaluru.

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<v Speaker 2>Working alongside the National Institute from Material Science in Japan.

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<v Speaker 3>Right exactly. Yeah, They managed to force electrons inside a

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<v Speaker 3>simple piece of carbon to behave in a way that

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<v Speaker 3>while classical physics dictates they simply shouldn't be able to.

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<v Speaker 2>They observed electrons flowing inside this single layer of carbon,

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<v Speaker 2>not like a gas of bouncing particles, which is what

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<v Speaker 2>we've always been taught, but like a nearly perfect, frictionless liquid,

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<v Speaker 2>which is wild. It's wild to even say out loud.

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<v Speaker 2>So today our mission is to explore how this actually happened.

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<v Speaker 2>We're going to look at how these electrons completely defied

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<v Speaker 2>a golden rule of physics, and how they transformed into

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<v Speaker 2>this bizarre fluid.

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<v Speaker 3>Like state, and crucially what that means for the future.

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<v Speaker 2>Right, what it means for the technology use every single day,

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<v Speaker 2>not to mention our entire understanding of the universe. So okay,

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<v Speaker 2>let's unpack this sounds good because to understand how you

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<v Speaker 2>break a one hundred and fifty year old law, you

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<v Speaker 2>first have to look at the scene of the crime,

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<v Speaker 2>and in this case, that scene is arguably one of

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<v Speaker 2>the most pristine, laboratory perfect materials ever created.

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<v Speaker 3>Yeah, the stage for this whole phenomenon is graphene. For

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<v Speaker 3>anyone who needs a quick visual just picture a single

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<v Speaker 3>atomic layer of carbon atoms arranged in a hexagonal.

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<v Speaker 2>Pattern like a microscopic honeycomb.

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<v Speaker 3>Exactly, or chicken wire, and being only one atom sick

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<v Speaker 3>makes it effectively a two dimensional material.

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<v Speaker 2>I have to push back on the timeline here for

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<v Speaker 2>a second, though, Yeah, because graphin was fantously isolated back

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<v Speaker 2>in what two thousand and four?

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<v Speaker 4>Yeah, two thousand, right, and people have.

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<v Speaker 2>Been calling it a wonder material for two decades. So

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<v Speaker 2>if we've known about graphine and its incredible properties for

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<v Speaker 2>twenty years, why are we only seeing this completely mind

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<v Speaker 2>bending behavior right now?

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<v Speaker 4>That is the big question?

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<v Speaker 2>Is it? I mean, is it like trying to observe

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<v Speaker 2>a perfectly still reflection in a pond where you need

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<v Speaker 2>absolute total stillness before the magic happens.

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<v Speaker 3>The pod analogy is actually a great way to think

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<v Speaker 3>about it, because for twenty years researchers have been looking

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<v Speaker 3>into a pond that was just a little too rippled.

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<v Speaker 3>Ah Okay, regular graphene, even when it's high quality, still

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<v Speaker 3>has microscopic impurities. It has tiny defects in the carbon lattice.

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<v Speaker 3>It even gets affected by the underlying substrate it sits on.

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<v Speaker 2>So it's never truly perfect in a normal lab setting.

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<v Speaker 1>Right.

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<v Speaker 3>But the team in Bengaluru, led by professor Arndam Ghosh

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<v Speaker 3>and PhD student Anikit Majimdar, they realized They couldn't just

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<v Speaker 3>use regular graphine. They had to completely eliminate the wind

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<v Speaker 3>causing those ripples.

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<v Speaker 2>How do you even do that at an atomic level?

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<v Speaker 3>Well, they took this incredibly pure graphene and they sandwiched

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<v Speaker 3>it inside layers of a different material called hexagonal boron nitride.

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<v Speaker 2>Oh wow. So they basically built a microscopic clean room

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<v Speaker 2>around the graphene just to protect it from the outside world.

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<v Speaker 4>Exactly.

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<v Speaker 3>The boron nitride acts as a perfect shield. It strips

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<v Speaker 3>away almost all the environmental interference, the impurities, and the defects.

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<v Speaker 3>They needed this ultra clean environment to reach a very specific,

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<v Speaker 3>highly delicate state called the direct point.

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<v Speaker 2>The direct point that sounds like something straight out of

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<v Speaker 2>a sci fi movie. What is physically happening at that point?

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<v Speaker 3>So, in normal conditions, graphene has charge carriers. These are

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<v Speaker 3>either electrons which carry a negative charge, or what physicists call.

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<v Speaker 2>Holes holes like actual physical.

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<v Speaker 3>Holes, not exactly. A hole is essentially the absence of

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<v Speaker 3>an electron, but it acts like a positively charged particle.

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<v Speaker 2>That's a bit trippy.

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<v Speaker 3>Think of a bubble moving through water. The bubble itself

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<v Speaker 3>is just empty space, right, yeah, but it moves and

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<v Speaker 3>acts like a distinct physical thing.

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<v Speaker 2>Okay, that makes sense.

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<v Speaker 3>So the direct point is this highly specific charge neutral

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<v Speaker 3>sweet spot. It's the exact transition point where graphine behaves

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<v Speaker 3>neither fully as a metal nor as an insulator, because

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<v Speaker 3>you have an equal number of electrons and holes perfectly

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<v Speaker 3>balancing each other out.

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<v Speaker 2>It's just sitting right on the fence.

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<v Speaker 3>Sitting on the fence in an environment so perfectly clean

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<v Speaker 3>and at such precise temperature conditions that the electrons basically

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<v Speaker 3>undergo a fundamental identity crisis. What you mean, They stop

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<v Speaker 3>acting as independent, solitary particles. Instead, they interact with each

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<v Speaker 3>other so strongly that they merge their behaviors. They form

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<v Speaker 3>a single collective mass.

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<v Speaker 2>And because they stop acting like a bunch of loan

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<v Speaker 2>individuals and become this collective crowd, they trigger this bizarre phenomenon,

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<v Speaker 2>the one that completely breaks the golden rule of how

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<v Speaker 2>metals handle heat and electricity.

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<v Speaker 3>Yes, which brings us to that shattered textbook you mention, right.

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<v Speaker 2>The eighteen fifties vitamin France law. Here's where it gets

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<v Speaker 2>really interesting, because the Vitamin France law isn't some obscure footnote.

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<v Speaker 2>It has been a bedrock principle of material science. Oh,

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<v Speaker 2>if I understand it correctly. The law essentially says that

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<v Speaker 2>in normal metals, thermal conductivity, so how well it conducts

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<v Speaker 2>heat and electrical conductivity how well it conducts a charge,

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<v Speaker 2>go hand in hand.

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<v Speaker 3>They are proportional, they are completely linked, and they're governed

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<v Speaker 3>by a universal constant called the Lorenz number.

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<v Speaker 4>Yeah, in conventional.

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<v Speaker 3>Materials like the copper wire running through your house, the

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<v Speaker 3>exact sum electrons are responsible for carrying both the electrical

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<v Speaker 3>charge and the thermal energy.

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<v Speaker 2>So they do both jobs right.

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<v Speaker 3>Naturally, if a material is good at conducting electricity, it's

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<v Speaker 3>going to be proportionally good at conducting heat. The two

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<v Speaker 3>processes are tied together by how the electrons scatter and

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<v Speaker 3>collide within the material.

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<v Speaker 2>I always picture it like a Buddy Cup movie. Heat

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<v Speaker 2>and electricity are partners. They always ride in the same car,

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<v Speaker 2>they go to the same places, they handle the exact

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<v Speaker 2>same cases.

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<v Speaker 3>That's a fun way to look at it.

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<v Speaker 2>But in this ultra clean graphene experiment, for the very

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<v Speaker 2>first time, the partners took separate cabs. They just completely

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<v Speaker 2>went their own ways.

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<v Speaker 3>Well, not quite separate cabs. Is actually more profound than that. Yeah,

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<v Speaker 3>thing of the electrical charge as the cars themselves in

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<v Speaker 3>a massive traffic jam, slowly inching forward together.

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<v Speaker 2>Okay.

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<v Speaker 3>The heat, on the other hand, is the sound of

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<v Speaker 3>a heavy base from a car stereo rickling through the traffic.

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<v Speaker 3>Oh wow, the physical cars, the charge, and the sound

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<v Speaker 3>wave the heat are moving completely independently through the exact

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<v Speaker 3>same system. What's fascinating here is the sheer scale of

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<v Speaker 3>the separation, right, because.

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<v Speaker 2>It wasn't just a tiny glitch, not at all.

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<v Speaker 3>The researchers didn't just observe a slight deviation. They observed

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<v Speaker 3>a massive two hundredfold violation of the weedam on.

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<v Speaker 4>Frond's law two hundred times exactly.

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<v Speaker 3>In this highly specific state. At the direct point, charge

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<v Speaker 3>and heat completely decoupled as electrical conductivity went up, thermal

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<v Speaker 3>conductivity actually went down, and vice versa.

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<v Speaker 2>They moved in completely opposite directions. But wait, if the

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<v Speaker 2>electrons are the physical vehicles carrying both the charge and

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<v Speaker 2>the heat, how on earth are they separating the two?

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<v Speaker 2>How does the base separate from the.

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<v Speaker 3>Car Because they can't shed heat by crashing into the

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<v Speaker 3>walls or impurities anymore in normal metals, An electron hits

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<v Speaker 3>a defect, loses energy and generates heat locally here. Because

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<v Speaker 3>the material is flawlessly clean, the energy has to go

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<v Speaker 3>so where else. It gets absorbed into the collective momentum

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<v Speaker 3>of the group, So.

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<v Speaker 2>The whole blob is just carrying the energy together sort of.

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<v Speaker 3>The electrical charge is still tied to the physical slow

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<v Speaker 3>movement of this collective blob of electrons, but the thermal energy,

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<v Speaker 3>the heat, starts traveling as a collective wave, rippling rapidly

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<v Speaker 3>through the fluid, independent of how fast the blob itself

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<v Speaker 3>is moving.

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<v Speaker 2>That completely flies in the face of classical physics.

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<v Speaker 3>Oh, classical physics completely fails to explain what's happening. The

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<v Speaker 3>researchers realize that even though the heat and charge had uncoupled,

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<v Speaker 3>their behavior still perfectly followed a material independent universal quantum.

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<v Speaker 4>Constant, meaning what exactly it means.

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<v Speaker 3>They were no longer looking at classical scattering. They were

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<v Speaker 3>observing quantum critical behavior. The system is sitting at a

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<v Speaker 3>tipping point governed by deep quantum fluctuations rather than classical mechanics.

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<v Speaker 2>Let me make sure I'm wrapping my head around this.

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<v Speaker 2>We've got electrons that have merged into a collective crowd.

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<v Speaker 2>The heat is rippling through them like a sound wave,

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<v Speaker 2>while the electrical charges moving as a physical group. But

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<v Speaker 2>how are they actually moving through the material to allow

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<v Speaker 2>this to happen. That's the key, because earlier you mentioned

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<v Speaker 2>they stopped acting like independent particles and started acting like

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<v Speaker 2>a liquid. Right.

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<v Speaker 3>This phenomenon is known as hydrodynamic transport. Let's compare it

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<v Speaker 3>to normal electricity again. Okay, In an ordinary copper wire,

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<v Speaker 3>electrons act like a gas. They move independently, constantly crashing

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<v Speaker 3>into things. They crash into impurities in the metal, or

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<v Speaker 3>they crash into the physical vibrations of the atoms themselves.

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<v Speaker 4>You're called phonons, right, yes, phonons.

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<v Speaker 3>Every time an electron crashes, it loses energy, generates heat,

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<v Speaker 3>and creates what we call electrical resistance.

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<v Speaker 2>So instead of electrons playing a chaotic game of pinball

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<v Speaker 2>and bouncing off the bumpers, lighting up the board, generating.

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<v Speaker 3>Key exactly, they don't do that here.

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<v Speaker 2>In this ultra clean graphene. There are virtually no bumpers to.

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<v Speaker 4>Hit, none at all.

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<v Speaker 3>The mean free path, which is the distance an electron

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<v Speaker 3>can travel before hitting something, changes drastically. Instead of hitting impurities,

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<v Speaker 3>the electrons start bumping into each other far more often

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<v Speaker 3>than they hit anything else.

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<v Speaker 2>Wait, if there are no impurities to crash into, shouldn't

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<v Speaker 2>they just shoot in a perfectly straight line at the

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<v Speaker 2>speed of light? Why are they bumping into each other?

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<v Speaker 3>Because they are packed into such a pristine, confined two

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<v Speaker 3>dimensional space, the forces between the electrons themselves become the

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<v Speaker 3>dominant interaction.

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<v Speaker 2>Oh, so they link arms and flow like a rushing river.

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<v Speaker 3>That's exactly it. Instead of flying straight, they continuously deflect

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<v Speaker 3>off one another, exchanging momentum. They enter a state of

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<v Speaker 3>hydrodynamic flow, moving as a single viscous liquid.

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<v Speaker 4>That is wild, and it gets better.

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<v Speaker 3>The researchers observe that this direct fluid has a viscosity

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<v Speaker 3>roughly one hundred times lower than water. It is approaching

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<v Speaker 3>the theoretical limit of a perfect fluid, which is a

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<v Speaker 3>fluid with near zero internal friction.

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<v Speaker 2>Near zero friction. So they are just effortlessly gliding through

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<v Speaker 2>the carbon.

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<v Speaker 3>Lattice, gliding, but with complex fluid dynamics. Because they are

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<v Speaker 3>acting collectively, Microscopic whirlpools and vortices of electrons form inside

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<v Speaker 3>the graphene.

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<v Speaker 2>Rural pools of electrons.

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<v Speaker 3>Yeah, just like water swirling around a rock in a stream,

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<v Speaker 3>the current folds back on itself in tiny eddies.

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<v Speaker 2>That is deeply strange. Yeah, microscopic whirlpools of electricity.

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<v Speaker 4>It gets stranger.

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<v Speaker 2>I don't know if my brain can handle stranger.

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<v Speaker 3>Well, because we are at the direct point. These electrons

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<v Speaker 3>aren't just acting like a liquid. They are behaving like massless,

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<v Speaker 3>relativistic particles. They are mimicking the behavior of particles moving

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<v Speaker 3>at the speed of light.

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<v Speaker 2>Okay, yep, my brain is starting to melt a little bit.

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<v Speaker 2>Massless relativistic particles swirling in frictionless whirlpools. Where else in

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<v Speaker 2>the universe does something like that even exist?

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<v Speaker 3>If we connect this to the bigger picture, the only

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<v Speaker 3>other places we see perfect fluids with these kinds of

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<v Speaker 3>relativistic massless properties are in the most extreme violent environments imaginable,

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<v Speaker 3>like where we see it in the cork gluon plasma.

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<v Speaker 3>But what It's the primordial soup of highly energetic subatomic

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<v Speaker 3>particles that existed fractions of a second after the Big Bang. Normally,

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<v Speaker 3>scientists have to use the massive particle accelerators at CERN

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<v Speaker 3>in Switzerland. You know, smashing atoms together at near light

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<v Speaker 3>speed just to catch a tiny glimpse of it.

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<v Speaker 2>Wait, you're telling me this pencil lead acts like a

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<v Speaker 2>multi billion dollars SuperCollider.

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<v Speaker 4>I am.

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<v Speaker 3>The behavior of this direct fluid in graphene is mathematically

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<v Speaker 3>linked to something called holographic duality, which is inspired by

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<v Speaker 3>black hole physics in string theory.

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<v Speaker 2>Okay, you're gonna have to break that down for me.

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<v Speaker 3>To put it simply, the mathematical equations we use to

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<v Speaker 3>describe the thermodynamics of a three dimensional black hole perfectly

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<v Speaker 3>match the math describing the flow of electrons on this

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<v Speaker 3>two dimensional sheet of carbon. It's like looking at a

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<v Speaker 3>mathematical hologram.

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<v Speaker 2>So physicists don't need to look into deep space or

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<v Speaker 2>smash atoms underground to study the edge of a black hole.

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<v Speaker 2>They could just put a perfectly clean piece of graphene

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<v Speaker 2>on a table in a lap.

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<v Speaker 3>Basically, yeah, graphene has become a tabletop laboratory for simulating

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<v Speaker 3>the extreme universe. It gives researchers an incredibly accessible way

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<v Speaker 3>to test theories about quantum entanglement and cosmic thermodynamics without

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<v Speaker 3>building impossible machines.

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<v Speaker 2>That is a staggering wind for theoretical physics, but as

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<v Speaker 2>amazing as simulating the Big Bang on a desk is

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<v Speaker 2>what brings back down to Earth for a second. So

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<v Speaker 2>what does this all mean? If you're listening to this

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<v Speaker 2>on a smartphone, you're probably wondering why your phone still

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<v Speaker 2>gets hot and what this frictionless, quantum river of electrons

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<v Speaker 2>actually changes for you.

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<v Speaker 3>It changes everything about how we design the physical architecture

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<v Speaker 3>of electronics because the biggest enemy of modern technology is

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<v Speaker 3>energy dissipation, which we experience as heat. Whenever you use

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<v Speaker 3>your smartphone, your laptop, or an electric vehicle, the electrical

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<v Speaker 3>resistance inside the components generates heat. It drains your battery,

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<v Speaker 3>slows down processing speeds, and requires bulky cooling systems.

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<v Speaker 2>Yeah, I mean, if I play a heavy video game

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<v Speaker 2>on my phone, within ten minutes, the back of it

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<v Speaker 2>is burning hot. That's the pinball game of electrons smashing

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<v Speaker 2>into impurities exactly.

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<v Speaker 3>Now, imagine if the electricity inside your devices could move

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<v Speaker 3>through pathways using hydrodynamic flow like the river right near.

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<v Speaker 3>Frictionless electron flow paves the way for ultra low power electronics.

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<v Speaker 3>Electricity could move with practically zero energy dissipation. Your phone

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<v Speaker 3>wouldn't overheat. Oh wow, The battery life would be extended

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<v Speaker 3>dramatically because you aren't bleeding out energy as heat. Processing

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<v Speaker 3>power could skyrocket because chip designers wouldn't have to worry

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<v Speaker 3>about melting the microchips.

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<v Speaker 2>Bypassing the friction of standard electricity is a trillion dollar

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<v Speaker 2>industry shift all on its own.

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<v Speaker 3>Oh absolutely, But that's just the beginning. The direct fluid

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<v Speaker 3>is incredibly sensitive to its environment. The sensitivity will enable

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<v Speaker 3>the creation of next generation quantum sensors.

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<v Speaker 4>What kind of sensors we are talking about?

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<v Speaker 3>Sensors that can amplify unimaginably faint electrical signals or detect

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<v Speaker 3>minuscule magnetic fields with a level of precision we've never

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<v Speaker 3>had before.

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<v Speaker 2>Where would we practically use sensors that sensitive?

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<v Speaker 3>It could absolutely revolutionize medical imaging. Right now, an MRI

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<v Speaker 3>machine requires massive room size superconducting magnets cooled by liquid

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<v Speaker 3>helium just to pick up the faint magnetic signals from

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<v Speaker 3>your body, and.

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<v Speaker 2>They are incredibly loud and claustrophobic exactly.

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<v Speaker 3>But if we have a perfectly frictionless quantum sensor, it

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<v Speaker 3>could potentially pick up the magnetic field of a single

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<v Speaker 3>firing neuron in the brain without needing those giant magnets.

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<v Speaker 2>That's unbelievable.

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<v Speaker 3>It also changes navigation systems, making them hyperaccurate, even deep

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<v Speaker 3>underwater or underground where GPS signals can't reach.

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<v Speaker 2>What about the decoupling of heat and electricity. We talked

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<v Speaker 2>earlier about the heat wave separating from the electrical charge. Yeah,

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<v Speaker 2>they aren't partners anymore. There has to be a way

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<v Speaker 2>to exploit that in engineering, right there is.

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<v Speaker 3>Because heat and charge are now decoupled, we can create

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<v Speaker 3>vastly improved thermoelectric.

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<v Speaker 4>Devices which do what exactly.

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<v Speaker 3>These are devices that turn temperature differences directly into electricity,

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<v Speaker 3>or use electricity to move heat. Think about a solid

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<v Speaker 3>state refrigerator. Currently, if you use electricity to push heat

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<v Speaker 3>out of a conductive material, the heat naturally wants to

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<v Speaker 3>leak right back through because the two properties are linked.

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<v Speaker 4>It's an engineering nightmare.

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<v Speaker 2>But if they are decoupled, you can pump the heat

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<v Speaker 2>out and it won't drag the electrical charge backward with it.

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<v Speaker 3>You've got it. You can build incredibly efficient systems for

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<v Speaker 3>harvesting waste heat from massive server farms or industrial plants

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<v Speaker 3>and turn that directly into usable power.

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<v Speaker 2>That would be huge for green energy.

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<v Speaker 3>Absolutely, you could have household refrigerators with zero moving parts,

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<v Speaker 3>no chemical coolants, and perfect efficiency. Furthermore, all of this

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<v Speaker 3>position's graphene to accelerate research into hybrid quantum classical computers.

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<v Speaker 2>Oh merging quantum computers with regular ones.

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<v Speaker 3>Right, it acts as the perfect bridge material between delicate

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<v Speaker 3>que bits and standard electronics.

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<v Speaker 2>It feels like this single April twenty twenty six discovery

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<v Speaker 2>just kicked open fifty different doors at exactly the same time.

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<v Speaker 3>It really did, And this raises an important question for

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<v Speaker 3>the global scientific community. How quickly can we rewrite the

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<v Speaker 3>textbooks and adapt our manufacturing?

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<v Speaker 2>Yeah? How long will that take?

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<v Speaker 3>It's hard to say, But this publication in Nature Physics

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<v Speaker 3>isn't just a fun quirk of a material.

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<v Speaker 4>It is a blueprint.

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<v Speaker 3>It shows us that if we can harness hydrodynamic electron

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<v Speaker 3>flow at a commercial scale, the electronics of twenty forty

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<v Speaker 3>are going to look as alien to us today as

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<v Speaker 3>a smartphone would look to someone from eighteen fifty.

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<v Speaker 2>Wow, let's take a breath and just recap this year's

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<v Speaker 2>scale of the journey we've been on. We started with

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<v Speaker 2>a single impossibly pure layer of carbon atoms. By protecting

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<v Speaker 2>it flawlessly from the outside world, scientists allowed the electrons

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<v Speaker 2>inside to hit this magical charge neutral diract point, and

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<v Speaker 2>instead of shooting around like chaotic pinballs, the electrons merged

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<v Speaker 2>into a frictionless quantum.

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<v Speaker 3>Ver beautifully summarized.

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<v Speaker 2>In doing so, they completely shattered one hundred and fifty

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<v Speaker 2>year old law of physics, proving that heat and electricity

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<v Speaker 2>don't always have to travel together exactly. The result is

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<v Speaker 2>a phenomenon that not only promises to revolutionize our computers,

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<v Speaker 2>our batteries, and our medical devices, but also lets physicists

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<v Speaker 2>simulate the violent mechanics of black holes in the Big

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<v Speaker 2>Bang right on a tabletop.

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<v Speaker 3>It's a humbling reminder that nature always has more tricks

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<v Speaker 3>up its sleeve. We thought we understood metals, and we

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<v Speaker 3>thought we fully understood graphene, But when probed with sufficient

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<v Speaker 3>purity and precision, we realized we had barely scratched the surface.

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<v Speaker 2>That actually brings me to a final thought. I want

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<v Speaker 2>to leave you with. Consider this the deepest, most violent

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<v Speaker 2>secrets of the cosmos, The chaotic, swirling soup of the

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<v Speaker 2>Big Bang. The incomprehensible math at the edge of a

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<v Speaker 2>black hole. They aren't just out there in the deep,

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<v Speaker 2>untouchable reaches of space, oh not. The exact same behavior

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<v Speaker 2>can perfectly mirror itself inside a single layer of carbon,

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<v Speaker 2>Essentially pens lad sitting quietly on a desk in a laboratory.

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<v Speaker 2>It makes you wonder if a material we've known about

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<v Speaker 2>and studied relentlessly for over two decades can still hide

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<v Speaker 2>something this profound. What other universe breaking secrets are hiding

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<v Speaker 2>in plain sight, just waiting to be found in the

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<v Speaker 2>everyday materials all around us.

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<v Speaker 3>The universe is always waiting to surprise you, as long

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<v Speaker 3>as you know exactly how to look.

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<v Speaker 2>Thank you so much for joining us on this exploration today.

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<v Speaker 2>Keep questioning the world around you, because clearly even the oldest,

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<v Speaker 2>most trusted textbooks don't have all the answers. See you

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<v Speaker 2>next time.