Hats off to the animator for the episode! This channel usually has great graphics to help explanations, but this time there was a lot, and it was outstanding.

@gtbkts

Жыл бұрын

Ya. The graphics really help me understand ( and even speculate on other instances). Which really helps me learn and remember the topic(s) they're explaining.

@softy8088

Жыл бұрын

Must be the money they saved by going with a 2D grid at 1:33.

@phpART

Жыл бұрын

Shoutout to Ajay Manuel

@meleardil

Жыл бұрын

So far this was the simplest yet still basically accurate visualisation of superconductivity. Beautifully concepted! Whoever did the anymations deserves great praise! I would have also added that in the same way you can have superfluid, when the fluid particles group up into "bosonic sects" and after that they just ignore everything outside their group (just like in real life sects), and the fluid becomes frictionless. Also there is the cool concept of high speed electronics, when the electrons are robbed of 1 dimension of movement (2 dimension electron gas) and forced into lattices, which limits their quantum states, also making it more easier to form quasi-bosonic groups. The whole concept of real life particles playing MMORPG to "pretend" to be imaginary particles and as such taking on new skills and perks is just hilariously funny! Lotsa wonderful and exiting thing are behind this specific topic of nature.

@matsupitsu

Жыл бұрын

I like how in the introduction the visualisation of the grid plays a nice little optical illusion: the white dots appear black when you're not looking directly at them. Quasi black dots.

I do research in superconductivity and I love when someone explains my research better than I can do. Really really good video!!!

@MrEiht

Жыл бұрын

DO more! No one needs resistance. Unless you are reinacting the french revolution...

@n-da-bunka2650

Жыл бұрын

@@MrEiht Resistance is futile... LOL oh you KNOW someone was going to say it!

@MrEiht

Жыл бұрын

@@n-da-bunka2650 you mean fertile? Don't use these french words, kids are watching :)

@KnightsWithoutATable

Жыл бұрын

@@n-da-bunka2650 I thought it was the ration of electric charge potential to electric charge flow.

@orangehatmusic225

Жыл бұрын

I love how PBS keeps changing their mind. They have videos talking about how quasi particles don't exist.. lol PS: Only quasi particles exist. Real particles don't exist. The double slit experiment proved this.

3:30 small correction, Boron is B, not Bo, although there is fringe historic precedent in Newland's periodic table

@WilliamFord972

Жыл бұрын

YES! The chemist in me was twitching.

@koomber777

Жыл бұрын

One of the silicones was missing an electron earlier too. Top row in the left

@vibaj16

Жыл бұрын

@@koomber777 *silicons

@koomber777

Жыл бұрын

@@vibaj16 oops! Muscle memory. I spent ages working with silicone in a lab and just disengaged my brain once I started typing

@Anonymous-df8it

8 ай бұрын

@@vibaj16 *silicon atoms

Being a musician I really like the concept of there being a quantum of sound. The fact that it plays a significant role in condensed matter physics is just a plus!

@Merennulli

Жыл бұрын

No idea what genre you play, but I could see caution labels on the speakers or instruments that read "⚠CAUTION: High Energy Phonon Emitter⚠"

@Fred-tz7hs

Жыл бұрын

I mean music is based on quantised sound too, no? we have music notes, not a music spectrum

@bluesillybeard

Жыл бұрын

@@Fred-tz7hs Kinda, ish. There's nothing stopping a musician from using any frequency, although they are limited to plank times I guess

@kayakMike1000

Жыл бұрын

Solidstate physics... Hmm, I think I like "condensed matter" name more.

@l3lackoutsMedia

Жыл бұрын

There are many hints in our ancient history pointing towards lost technology based on sound to achieve various things, as well which is mind blowing.

One of the most mindblowing episodes that I have seen on this channel. Which is saying a lot considering how often y'all blow my mind.

@fbkintanar

Жыл бұрын

I love this topic, especially as I was recently trying to explain to my brother how electron holes (quasi-positrons?!) flow in a semiconductor, as a macroscale quantum phenomenon.

@ChristopherMeadors

Жыл бұрын

I had the exact same thought. I always look forward to a new Space Time, and usually learn something. This episode made so many of the bits of knowledge at the edges of my understanding just click into place.

@n-da-bunka2650

Жыл бұрын

@@fbkintanar Now all you have to do is to forward this video to him so that he will understand it and be able to unravel the confusion you told him about? LOL-ish

@kdeuler

Жыл бұрын

Ditto!

These are some of the best videos on the internet. Other producers--feast your eyes: the content is relatable and they trust their audience with the science in all its glory.

@barretprivateer8768

Жыл бұрын

Matt O'Dowd is a legendary presenter as well.

@js2010ish

Жыл бұрын

Yes, superb yet simple animations & nice ambient music

@boyanbogdanov1854

Жыл бұрын

@@barretprivateer8768 His Celtic face makes you thrust him. He looks and he surely is a very nice man.

@SaltyBob355

Жыл бұрын

I thought he was Aussie.

@russellwarren9595

Жыл бұрын

@@SaltyBob355 people with Celtic ancestry dont stop passing on their genes when they leave the British isles.

Always love to see solid state physics on this channel! It warms my materials scientist's heart (via a quantum scale buzz of phonons). It would be cool to see more on some of the quasiparticles you mentioned and but didn't have time to cover (or even ones you didn't mention, like plasmons).

@DoggARithm

Жыл бұрын

Oh my god I literally just ranted about those in the comments too😂 I've read surface plasmons could be used to exchange quantum information between photons, which could lead to radically more heat-tolerant quantum processors, where light is used to carry qubits from logic gate to logic gate, instead of supercooled electrons

@renderproductions1032

Жыл бұрын

@@DoggARithmamazing!

@monosespaciales

Жыл бұрын

bump

@falnica

Жыл бұрын

I'm sure they'll get round to that

@MrTheomossop

Жыл бұрын

Or quasicrystals - not quite the same vein as quasiparticles(probably..) but extremely compelling in their implications

This is the best description of the workings of these diode junctions I have seen. I have read a few book descriptions which always seem to confuse as much as explain. It is a pity this stuff was not around when I was doing my science degree over 50 years ago when it was so difficult to get any information on anything. What a great age it is now for anyone interested in these topics.

@Xapheus

Жыл бұрын

I took a circuits course in college that discussed things like diodes. I didn't really understand them to the degree I do now after watching this video. Both the conventional description and the quasiparticle description uniquely illuminated my understanding of diodes, emergence, and physics in general. Yeah, it was much more difficult to conceptualize everything before PBS Spacetime and all the other good educational content available now.

@paparapiropip87

10 ай бұрын

Currently studying a lot of these topics as a PhD candidate and I can confirm sir!

You know I’ve read books on semiconductors and never really made the intuitive leap you just gave me regarding n-type and p-type semiconductors until now. Thank you, what a lovely presentation.

I was an electrical engineer long before becoming a physics teacher, and I've watched your channel for a number of years. But this show episode is one that got me really quite excited. And that's not excited because you've shown me something new, you do that often enough. Excited because it's something new that's hiding itself on the reverse side of a basic schema that's in plain sight. Good work here my man, this episode was definitely reinvigorating.

@jamieg2427

Жыл бұрын

would you say those somethings are quasi-new?

@basilbrushbooshieboosh5302

Жыл бұрын

@@jamieg2427 no not the parts thereof but the way to view it yes

@asdfghyter

Жыл бұрын

does your excitement give rise to a quasi-particle, like it does with excited electrons in a crystal? could you describe it as a wave/field with quantized (energy) levels?

@andrekz9138

Жыл бұрын

Well put

@simonmultiverse6349

Жыл бұрын

Hello, Matt. I notice that there is *ANOTHER* Matt, this one called Matt Parker, and he discusses many topics in mathematics. Could it be that Matt O'Dowd and Matt Parker are a virtual pair of particles which could act as a composite quasiparticle? I would be interested to know what would happen if they got together? Something tells me that the Parker wave function and the O'Dowd wave function would make a new particle with many interesting properties. Exploring this could prove to be very fruitful.

Thank you for the clearest explanation of how a diode works. I knew the result of what they do, but never understood how they actually do it :)

Always a fan, but I really enjoyed this one. It hit a sweet spot for me where I somewhat understand your description, but I was also amazed (and delighted) by the consequences. Also it brought Cooper Pairs from 'heard of, but no understanding' into the 'vaguely understand' category. Just glorious. Thank you.

@c.ladimore1237

Жыл бұрын

same. that's where the smug "i know this" got punched by "what the heck"

I just play all these videos on repeat and slowly get smarter. 3 years ago, I didn't know anything about physics. Today, I'm more competent than all my friends and can have a reasonably deep convo with my uncle who's a physicist. Thank you Matt and thank you to the entire PBS team!

The real particles are the friends we made along the way

@sofiamn_05

Жыл бұрын

And the quasi-particles are the friends we almost made along the way

@MNbenMN

Жыл бұрын

@@sofiamn_05 so quasi-particles are facebook friends?

@DoggARithm

Жыл бұрын

And the imaginary particles were more real than the real particles. I mean numbers

@sofiamn_05

Жыл бұрын

@@MNbenMN i guess lol

@Lucien135

Жыл бұрын

Me when im trying to understand science

Incredible explanation. This made more sense of quasi-particles than an entire semester of solid state physics. Would love to hear your explanation for effective mass!

This is mind-blowingly cool and illuminating. I'd love to hear about more sorts and applications of quasiparticles in Space Time!

@meleardil

Жыл бұрын

In the same way you can have superfluids, when the fluid particles group up into "bosonic sects" and after that they just ignore everything outside their group (just like in real life sects), and the fuid becomes frctionless. Also there is the cool concept of high speed electronics, when the electrons are robbed of 1 dimension of movement (2 dimension electron gas) and forced into lattices, which limits their quantum states, also making it more easier to form quasy-bosonic groups. The whole concept of real life particles playing MMORPG to "pretend" to be imaginary particles and as such taking on new skills and perks is just hilariosly funny!

Awesome work with this video! Another cool thing: when Cooper pairs are formed, they release a phonon with an energy of roughly 2 times the superconducting energy gap. These phonons can actually smash into another Cooper pair and split it back into two quasiparticles. This is currently one of the major obstacles in superconducting quantum computing. High energy phonons can also be generated from cosmic events like gamma rays. Some research teams are burying their quantum computers several klicks underground and shielding them with lead bricks to reduce Cooper pair splitting due to high energy particles. The craziest thing? It actually seems to be working; the underground qubits are coherent for far longer than those studied topside.

1:49 That missing electron up top was killing me, glad the animator fixed it later on 😂 great video!

@elijahbecker4460

Жыл бұрын

Glad I wasn’t the only one to notice.

I dropped out of highschool because there were no teachers like you. I love your videos and I have to watch them twice to understand them sometimes 😂 I am quite good at math for a drop out and I love physics as a hobby. I even read "The Elegant Universe" in prison. Keep it coming, sir.

@tommymclaughlin-artist

Жыл бұрын

Same.

I lost it at college when they said the holes were positive particles. I never realised how deep the rabbit hole goes! Luckily these concepts travel straight through my brain without interacting with my understanding neuron's so I'm not too affected by it all. I just use the billions of transistors in my phone for serious research into cats🤣

I don't know!

@markmuller7962

Жыл бұрын

Yes

@Jump-n-smash

Жыл бұрын

When?

@BeardedDragonMan1997

Жыл бұрын

😮

@sanketbaxi8064

Жыл бұрын

A summary of my Amazon answers feed

In silicon semiconductors, holes move about half as fast as electrons. To compensate for this, the conduction channels in PFETs are typically made wider compared to NFETs in the same position. Now, this doesn't strictly have to be the case, but it makes rise times slow compared to fall times, and this complicates computing static timing analysis. It's easier if a logic gate of a given type can be modeled as having the same speed whether its output is rising or falling. You could just model the gate's speed based on the slower of the two edges, but then that means your faster transistors are burning more energy than necessary for a given switching speed, and power dissipation and energy consumption are first-class concerns in modern large scale semiconductors, so you either want to size up the slower transistors or size down the unnecessarily fast ones.

@jespermikkelsen7553

Жыл бұрын

Why do electron-holes move slower than electrons? I would expect them to move with the exact same speed - but what do I know about semiconductors... 🙄

@theosib

Жыл бұрын

@@jespermikkelsen7553 I'm not sure about the physics. Thus is just what semiconductor engineers tell me.

@Hecarim420

Жыл бұрын

@@jespermikkelsen7553 It's little like blowing wind. Molecules of air just move a little and just carry the force(charge in case of electrons) to next molecule ==> Everything works in "local scale" but if you earlier WIRE the thing it will create electricity on both ends simultaneously (similar to "violating" speed of lightning by pointing super powerfull laser into moon and fast turning around self, you will artificially make speed faster than speed of light but actually not speed of causality). Sorry, it's probably not the clearest explanation and it's not answering "why" question part ¯\_(ツ)_/¯

Gonna need a whole spinoff series on quasiparticles now.

This is awesome! I wish I had this exact explanation available 30 years ago, when I was trying to learn the meaning of NP semiconductors. Thank you for another amazing video!

Worked with electronics for years, and this finally helped this phenomenon fully click. Great work, as always.

This episode was the best explanation of cooper pairs I've ever seen. Bringing in phonons to explain the how of cooper pairs makes this all add up a lot better. Also, clarifying they aren't really being pair-like, they all just flow together, also allows me to better understand the steady state environment of superconductivity.

Electrical engineer here, adding a little bit: when we talk about electrons in a crystal usually we refer to a quasi-particle that behaves like electron but has a different "effective" mass. This effective mass can change depending on the energy of the electron - which leads to some interesting properties. For example, in some materials - a high enough energy of the electron can lead it to have a lower effective mass (shifts it to a different valley in the E-k diagram).

Four years of electrical engineering class, and I never heard this explained. Thank you, very well done.

They really nailed the music in space time. It comes in perfectly while Matt is talking, all mysterious and ominous like, so you know you're about to be mind blown.

Can't wai for an episode on the recent quantum wormhole simulation experiment trying to explain quantum entanglement!!

@greedowins2917

Жыл бұрын

Per Sabine (another youtube scientist), it was all hype, and her breakdown seemed accurate. Kinda doubt Matt will do a specific episode on it.

This is probably like the best video on things I didn't know about science that exists on KZread to date that I've seen. And I'm going to watch it twice.

12:45 Phonon-mediated superconductivity (the standard BCS theory) describes Cooper pairs in a singlet state (S = 0). This is required because the spatial part of the wave function is symmetric under exchange of electrons (S-wave) but the whole spin + coordinate wave function needs to acquire a minus sign after the particle exchange to satisfy Pauli's exclusion principle, so you need S = 0. Adding up the angular momenta of two spin-1/2 particles you can either get S = 0 or S = 1, so theoretically you CAN have triplet superconductivity. To this date I don't think they have found any conclusive evidence of triplet (S = 1, p-wave) superconductivity. There are some very specific platforms like Josephson junctions with ferromagnetic barriers that can magnetically align the spins of the Cooper pairs leading to the coexistence of singlet and triplet superconductivity aided by spin-orbit coupling, but "standard" superconductors (e.g. excluding high-temperature ones) have zero-spin Cooper pairs.

I swear every time I watch an episode of PBS Space Time, a new thing is introduced which completely changes the way I think about reality.

1.Could you please consider making a video showing the idea of the Dirac sea and overall the analogies between behaviors of electrons/holes in crystals and particles/antiparticles in vacuum? 2. Is it possible to build anything like a Standard model for quasiparticles (even though the properties of those are dependent on the medium they are emerging in)?

@falnica

Жыл бұрын

I like the idea of a "standard model for quasiparticles" but it would be a bit like "classifying all possible songs." Even if there are broad genres there will always be something new that requires a new classification

@n-da-bunka2650

Жыл бұрын

Add a #3 Any possibility that Quasi-particles might be the source of "dark matter"

@BartoszChmura

Жыл бұрын

@@n-da-bunka2650 they can't be - they are emergent entities. Consider phonons - "particles of sound". They need a material in which they emerge. We would see the material first. Also - their (quasiparticles in general) mass would have to exceed the mass of the material itself - as there is more dark matter than known matter.

@blinded6502

Жыл бұрын

@@falnica I wonder if real particles are also quasiparticles, but in a material that we call spacetime fabric.

@userumbleandgettr4freespee501

9 ай бұрын

@@blinded6502hmm

I've wondered for a while what a semiconductor is/how it works. It's annoyed me that I could only ever find either technical stuff dense with terms of art or explanations so oversimplified they'd barely work as dictionary definitions. I really didn't expect to finally understand that today but I 1000% appreciate it.

I've studied physics in college and I didn't know any of this. It's amazing how one can always learn new things about nature.

I was an undergraduate taking a materials chemistry course when I learned about holes. I accepted the course material enough to do well on exams, but I rejected what I learned about the models because it didn't line up with my ignorant worldview. I don't have a resolution for the layperson's misunderstanding of science - other than a combination of time, humility, and education (more PBS Spacetime).

@fbkintanar

Жыл бұрын

We need science educators to start schooling the the intuitions of students to the modern perspective that quantum is not weird, it is classical limits and smoothness that is a weird fiction. You can't get infinitesmally smaller than the Planck limit. We need to outgrow the easy metaphors of earlier eras. Sunsets are celestial motion of the earth, not of the sun moving downwards. Timezones are simultaneously different across the world, and time dilates to a moving observer. Quantum effects are macroscopic too, like semiconductor band gaps, the quantum tunneling and fusion behind sunlight, maybe even photosynthesis.

@cavios8889

Жыл бұрын

@@fbkintanar "quantum effects are macroscopic too" Bose-Einstein condensates, everyone. When a macroscopic system starts acting like a singular wavefunction, then that's our cue to curl into the fetal position and accept that we occupy an infinitesimal sliver of spacetime.

@cavios8889

Жыл бұрын

Please read the above with the appropriate O'Dowdian cadence.

So great! Now I can send this video to people who ask me about my research!

Great video! As someone who works in the semiconductor industry and used to grow silicon rods it makes me happy to see doping explained. Lol

THANK YOU. I tried looking up cooper pairs a few times, and this is the first time anything about them has stuck.

Well, now I have some idea of what a quasiparticle is, why we “created” them, and have some understanding of phonons and cooper pairs, which I’ve heard of many times but didn’t know what they actually represented. The roton is completely new to me, but then again, superfluidity is relatively new to me, I think the first I heard of it was perhaps 15 years ago.

It’s funny, at the intro I was like “isn’t that just like electron holes?”, and then you proceeded to spend the first five minutes summarising my first few weeks in electrical engineering class! I laughed a lot at “mass: yes” for the holes too But I suppose plenty of people who like physics haven’t also dabbled with electronics :)

@caydjj

Жыл бұрын

I was thinking the same thing. At least when I was in school for electrical engineering, we treated the electron holes at basically the same level as electrons, especially when learning about semiconductors

@kaitlyn__L

Жыл бұрын

@@caydjj and of course that goes back to Dirac’s “electron sea”, although in that case the holes were antimatter. But at the time he thought he was using an emergent property of his mathematical model, and only realised it was a real particle later! So it’s not electron holes in the modern sense, but he called it that!

Wow, this is the best episode yet and one of the best science videos I've seen. Such a simple concept that also helps to understand what regular particles "are" and yet I've never seen it explained in so approachable way. Thank you.

This is easily the best and simplest explanation of cooper pairs I have seen. Well done!

These quasiparticle phonons are so similar to photons, it makes me wonder if photons are actually quasiparticles themselves. It's the first way of thinking of them that helps me actually understand the whole particle/wave duality concept.

@SteveAcomb

Жыл бұрын

good thinking! always important to remember that our current physics is always just a model and that the map is not the territory

@Carewolf

Жыл бұрын

Well that would require an Ether that the photons is vibrating through. I think physics dropped that idea 150 years ago.

No mention of magnetic monopoles? They seem a great example, as something that's thought impossible in real particles being created experimentally as a quasiparticle. Felix Flicker gave a great Royal Institution talk on them a couple years ago.

Without exaggeration I say to you: these videos enrich my life

Fantastic video, I was thinking recently about how superconductivity works and that I have to look into it sometime and I really did not expect to learn that from a new perspective going into this video. Thank you!

Nice! I study semiconductor physics so this was the first video I actually had a decent background in. Lets me gauge the level of depth for the topics I don’t have a background in. The videos always do such a good job of simplifying super complex things. Takes years reading through textbooks and resources to understand it this clearly.

This is one of the best channels and Dr Matt has a lot of knowledge in astrophysics and he is one of the best teachers in physics and all the support to the channel and Dr Matt 🙏🤝

This video is my 2022 highlight! It just solved a dozen 'wait but why' moments I had in the past. ♥

I learnt about cooper pairs in high school physics, and now to finally understand what exactly they are and how they work is incredible!

@adampope5107

Жыл бұрын

My high school physics ap class was taught by a person who thought your mass changed on the moon but your weight stayed the same. Needless to say, I didn't learn much in that class.

@DrWhom

11 ай бұрын

@@adampope5107 So that person mixed up the words? Strange, as everybody knows weight is what you determined with scales, and mass is what opposes your efforts to accelerate something. And we've seen astronauts hopping about on the moon. Either your teacher was incredibly dumb, or they just had a case of word-swap aphasia.

Quasiparticles to me sound like they are the emergent physical activity of physics, it's so cool.

@userumbleandgettr4freespee501

9 ай бұрын

I think what we consider fundamental “particles” or field are actually quasi particles of some underlying field or something. We use imaginary numbers and such as possibly more than just accounting tricks, and if this is true, then it would make more sense to me that we are not at base level here in our 3 dimensions. I don’t even understand the concept of time as a dimension, but I keep an open mind

Thank you for explaining the concept of the Cooper pair. I see science news articles about them all the time but they never say what they are, what produces them, and how they actually cause superconductivity. It might not be a complete explanation but it at least gives one an idea of what's actually going on. That instantly makes this one of my favourite Space Time videos, right up there with the one that tells us how the Higgs field works without that BS about people crowding around celebrities.

Great explanation of the quasi particles. Symbol for boron is B.

heh, you really explain things clearly and now I'm sure in it. I learnt this in the school, then in the university, then read a lot working as an engineer and I regret a bit that I did not had such well presented explanation from the beginning!

Great video. Sir, you are an excellent science communicator.

Without PBS Space Time life would be more dull 🥰

Quasiparticles are one of those things I have a hard time wrapping my head around and untangling conceptually. Thank you for this episode getting me started in that direction; I would definitely enjoy more videos on the subject in the future! Merry Christmas out there everybody! ✝️🎄

Always loved videos on such topics! Prof. Matt here's a request for you, please look if you can upload some videos on widely discussed theories like loop quantum gravity, etc.

@greedowins2917

Жыл бұрын

Pretty sure he did a video on this specific topic.

@sid6645

Жыл бұрын

Yeah under the "quantum foam" or something.

This was such a great episode. Learned a lot and even was able to successfully pretend I understood it all :-)

This may be your best video so far and that's saying a lot considering the amazing quality of what you always produce!

You guys are the best source for high quality condensed science, that is truly easy to digest.

I'm a Chemist. I died slightly inside when the atomic symbol for boron was written and "Bo" rather than the actual symbol, "B". Physicists....sigh....

@johanhaukeness9492

Жыл бұрын

My brain hurts too. Don't feel alone 😑

@argoneum

Жыл бұрын

Boronium? 😸

@rheticus5198

Жыл бұрын

All I know is Br and Ba from some TV show.

@mrlucasa223

Жыл бұрын

@@rheticus5198 💀

@kaitlyn__L

Жыл бұрын

Does it “help” that my electrical engineering teacher did the same mistake over a decade ago lol

This is mind-boggling for a layman like me, I never realized these could be treated as particles, and it makes sense considering real particles are oscillations too.

Wow! This video really stood out for me. I have heard of phonons but never seen them presented in this way!

This episode for some reason was particularly clear and digestible. I think he’s slowed down his presentation so we can take a moment to comprehend what he’s trying to explain. Good job!

love this!!! can we have more about quasiparticles soon please?

Love the increase in condensed matter topics on the channel! Hoping a video on the renormalization group and the Ising model is coming up soon. One question I have about cooper pairs: given the mass difference between electrons and the nucleons of the lattice and their relative velocities is the picture that electrons are attracted to each other via a build up of positive charge from nucleons accurate? Wouldn't the electrons fly past the nucleons effectively not feeling the pull from the nucleons?

@anthonyward8805

Жыл бұрын

They’ve already done the ising model video a long time ago. And for the cooper pairs, I think it’s actually a long range pairing, on the order of 100 nm so basically the lattice vibration is also that long and the electron doesn’t zip past it as fast

@stephendaedalus7841

Жыл бұрын

@@anthonyward8805 I don't remember a video on the Ising model. Did they discuss it in terms of the renormalization group and scale invariance? I think it's a nice connection between high energy theory and condensed matter. I'm having trouble finding the video. Also, I'm still not convinced by that argument. For instance, the most probable pairing of electrons in a Cooper pair if of electrons with opposite wavevectors, for which this physical picture doesn't account for.

amazing idea. sounds like a useful first step towards explaining emergent phenomena.

Excellent, as usual starts so innocently and deep the rabbit hole we go.

Maybe we should just start thinking of particles themselves as "things spacetime can do."

I spotted a mistake in the information about electrons and holes: When comparing electrons and holes properties the first time, it is said that mass of the electron is constant and hole's is variable - actually, in crystals both e and h masses are variable! even more, they are direction dependent, if crystalline structure is not cubic. It is due to the fact, that in periodic potentials electrons' mass is derived from relation between energy and momentum (wave vector). The same rule applies to holes - and e and h masses can be different from each other!

@simonO712

Жыл бұрын

To be more specific, this kind of electron is actually a quasiparticle as well.

That was a beautiful experience when studying physics: When phonons were first taught, they seemed way more invented, just a specific useful way the describe soundwaves and heat in solid matter. But the more you worked with it, the more you saw that they are so similar to photons, which are also just a useful way the describe the world. The question what is "really exists" in physics can be pragmatically answered: If is makes correct only predictions, it is a real as all the other parts of physics, that make correct predictions.

I;ve been watching Matt for years, i;ve always had a somewhat piecewise understanding of superconductivity,but found it difficult to really grasp,this is THE BEST explanation i've ever heard,if you read this Matt,i raise my glass to you,thanks mate!!!

Finally!!! A new episode.

When you leave your leafy greens in the freezer too long you get a crystal lettuce.

This is wild timing! I just began my first undergraduate research project in developing a computational model of exciton motion and photon absorption/emission in mono layer WSe2. Super cool to see a video from you guys about quasiparticles as I’m still trying to sort everything out myself haha

Great video! It's amazing how much deep physics there is going on in our everyday devices.

That is fantastic property of our particles reality to create virtual particles and then virtual reality made of them. And again virtual-level-2 made of virtuals-level-1. (Virtual reality not in computer simulation terms). Ok, the question is: "is it possible, that our REALITY is indeed virtual of some more basic, more real particles?" Can we examine this somehow?

I've always found it fascinating how much Music and Physics overlap. It's interesting how much understanding chords, harmonies, overtones and frequencies translates 1 to 1 to quantum physics.

@TheUglyGnome

Жыл бұрын

Don't forget how sound wave vs. it's frequency content translates 1 to 1 to uncertainty principle.

@sjsomething4936

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I’ve got an entangled pair of violins in my home lab 😅

@Sloppyjoey1

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@@TheUglyGnome Could you elaborate on that? Because as far as I'm aware it's probably an indication that the "uncertainty principle" is just a placeholder for 'unknowable" rather than "random". I tend to think physics / music is missing the forest for the trees in this area in general. It's a dicey subject where everyone agrees on observation but disagrees on cause/interpretation

This is probably the best spacetime episode yet!

So cool to see a video on the topic of something I learned in college for Electrical Engineering in my class on solid state electronics, and with such amazing animations I couldn't have hoped to see in college. Amazing job expanding from that into other quasiparticles. We never called them that, just holes lol

What about polaritons? Really curious about those, since they are used to describe the slowing of light in a medium using QFT. PS. This holes and Dirac holes I believe as well as phonons are used often in 2D materials, like graphene based materials.

@luanmartins8068

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I recommend Xenosium's Channel, He always produce very very good content about modern topic in cond mat, including the one you juts wrote above.

@tommywhite3545

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@@luanmartins8068 I can't seem to find it.

@luanmartins8068

Жыл бұрын

@@tommywhite3545 Sorry, I spelled the name wrong, the correct name is Xenosum, please have the link kzread.info/dron/EI6P5v0rJEjj9HYiVmeiuQ.html

oh my god did PBS spacetime just give Boron, symbol of B, a made up symbol Bo? thats hilarious

mindblowing episode!! thank you!! ( title bit weird as the episode actually focusses on the similarities not on the differences, but that's no biggie )

Fantastic script in this video! The explanations here are so understandable and logical!

First to say first

@RichMitch

Жыл бұрын

🤝🏻

@shadow15kryans23

Жыл бұрын

@@RichMitch Ye, I saw your comment and was like "W8 Hol up" and edited to say "First to say First" rather then just "First". XD GG bruh

This was eye-opening, one of the best episodes so far!!!!

This is the best content I consume regularly.

Excellent episode, PBSST! Quasi-particles have always fascinated me. Thank you!

I always enjoy your videos. Since I'm a bit of an Astronomy geek/nerd myself I always enjoy learning new things about our Cosmos everyday! Thank you PBS!

Mind blown. This topic deserves and perhaps demands many follow-up episodes to explain and explore it. I am equal parts intrigued and befuddled. Waiting for comprehension...

The amount of cool things we get from emergent properties blows my mind.

@larscarter7406

Жыл бұрын

The amount of emergent ideas about stuff on KZread is awesome.

this really answered the questions I had about quasi-particles, great video

Quasiparticals WOW!! It's just opened up a whole new world to me! thanks space time and cheers matt

Very good intro to bridging from the practical physical ideas about phenomena in states of parallel coexistence, ie wave-particle packet-envelopment of particular coherence-cohesion sync-duration resonance in quantization objectives inside-outside holographic projection-drawing positioning and condensation presences.., which requires a "double think approach another aspect of language all together. Number Theory and Logarithmic Timing-Spacing in Absolute zero-infinity pure-math reference-framing condensation-coordination wave-packaging. Good stuff.

Awesome omg I've been waiting for this so long thank you! I requested this in the questionnaire and you guys did a great video on phonon phenomenon!

Thank you for using the word "phenomenon" correctly. I warms the cockles of my heart.

My father passed away a few months ago. Your videos have really helped me Matt. It's so nice to know that there is so much that we don't know. It's given me a small measure of peace thinking that there might be something after death. There is so much we don't understand and I wonder if we ever will.