Atoms and Sporks
Atoms and Sporks
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The Weird, Weird Quantum Physics of Solar Panels (And Everything Else)
In this video we talk about the weird quantum physics of photovoltaics including band theory, the Fermi sea, carrier lifetimes and recombination (and school buses!)
Other recommended videos about quantum physics and technology:
How Quantum Physics Built the Digital Age:
czcams.com/video/KunEYnIaGGc/video.html
The Quantum Limit of Computing:
czcams.com/video/67S4IyakRko/video.html
Quantum Tunneling and Technology:
czcams.com/video/XnNC6uHkKMY/video.html
Technical Caveat: It is common practice when drawing energy band diagrams between two different materials to draw them such that the electron filling level (i.e. Fermi level) is constant from material to material. However, here we take the approach of effectively having a flat vacuum level and allowing the Fermi level to spatially vary. These two approaches are ultimately equivalent but this way has the advantage of not having to discuss issues like the physical meaning of the electrochemical potential and discussing where and why the Fermi level actually rests in a doped semiconductor.
zhlédnutí: 12 930

Video

Longer Days Are NOT The Reason For The Summer Heat
zhlédnutí 1,7KPřed 2 lety
Today we have a short little video where we look at what really causes summer to be "summer" and what effects most contribute to the seasonal variations in temperature
Where Does Light Go When You Turn Off The Lights In A Room? Could We Make A Forever-Bright Room?
zhlédnutí 8KPřed 3 lety
I hope you enjoy this short video on a simple physics question... with some surprisingly interesting implications.
Our Future Depends On Invisible "Metals"
zhlédnutí 8KPřed 3 lety
In this video we'll talk about transparent conductive oxides (TCO), indium tin oxide (ITO), transparent polymers, graphene and carbon nanotube (CNT) networks and the important role they play both in our current technology and in our hope for a renewable energy future.
Real Physics in LESS Than Three Dimensions (Flatlands in Silicon)
zhlédnutí 2,3KPřed 3 lety
In this video we discussed the quantum physics of carrier confinement in everyday technologies as well as a bit about the motivations behind heady hyperdimensional physical theories like string theory. Discussion about the 5D Density of States graph: This graph is actually a bit of a cheat, because actually one can show that it’s not possible to have matter *at all* in a universe with 5 infinit...
Holiday Physics: Why Do We STILL Not Understand Ice Skating? (And How Does... Ketchup Come In?)
zhlédnutí 1,5KPřed 3 lety
Rheology, Thixotropic Fluids and Ketchup! The perfect recipe for a holiday special!... Right? Further Discussion of Apparatus: The device used in the PRX paper was called a “stroke-probe” and it was literally basically a fancy tuning fork with a glass bead glued to it and this glass bead would be touched ever so gently to the surface of ice and thus play the role of our skate top layer. And thi...
3 Things Hollywood Doesn't Understand About Basic Physics
zhlédnutí 2,2KPřed 3 lety
In this video we have a bit of fun and talk about some Physics Phails of our favourite Hollywood movies and TV shows.
What Are Quasiparticles?: The Real “Fake” Particles of the Universe
zhlédnutí 13KPřed 3 lety
You've probably heard of the Fundamental Particles of the Standard Model, but have you ever heard of the literally hundreds or particles that don't get the same attention? Let's talk about QUASI-PARTICLES A couple more links about quasiparticles with “beyond the Standard Model” properties: Magnetic Monopoles: www.sciencemag.org/news/2009/09/physicists-create-magnetic-monopoles-sort Majorana Fer...
Tours Through Physics: Nanoplasmonics (Part 3)
zhlédnutí 12KPřed 3 lety
Finally, finally, FINALLY we conclude our tour through the field of Nanoplasmonics. In this final video we discuss the physics that drives the useful effects that underpin this field.
Quantum Tunneling and Technology: From Flash Memory to Satellite TV and Appliances
zhlédnutí 14KPřed 4 lety
In this video we talk about what "oh so mysterious" quantum tunneling actually is and how it is used in technologies such as flash memory and zener and tunneling diodes. For more information about flash memory and quantum tunneling specifically see this blog post: atomsandsporks.com/2020/04/19/quantum-tunneling-and-flash-memory/ Technical Caveat #1: As I am providing a conceputal overview I hin...
What Are Electrons REALLY Doing In A Wire? Quantum Physics and High School Myths
zhlédnutí 176KPřed 4 lety
In this video we explore the surprisingly complex and quantum mechanical physics of an everyday situation: electrical current flowing in a metal wire
What is Liquid Crystal Physics? Smart Materials, Lasers, Kevlar, LCDs and More!
zhlédnutí 3,3KPřed 4 lety
Here we take another Tour Through Physics and introduce a field of physics that doesn't maybe get the exposure it deserves. This time: Liquid-Crystal Physics For an excellent, more detailed video on LCDs specifically see The Engineering Guy: czcams.com/video/jiejNAUwcQ8/video.html Note on laser pumping: Semiconductor lasers, like those in your CD/DVD/Blu-ray player are electrically pumped meani...
How Quantum Physics Built The Modern Age
zhlédnutí 7KPřed 4 lety
The "Quantum Age" isn't coming, it's been here all along. From your Smartphone to your Game Console, quantum physics is at the heart of all of it Sources for experimental images: Those two images are a so-called "band structure diagram" of MoS2 adapted from data from J. Phys.: Condens. Matter 24 (2012) 475504 and a Scanning-Tunnelling Microscope (STM) image of certain thallium compounds adapted...
Cooling with Light! Zeeman, Laser, Chirp and Doppler Cooling Explained
zhlédnutí 22KPřed 4 lety
In this video, we look at some of the key physics behind a handful of techniques that can drive atoms to incredibly cold temperatures using nothing but light.
A&S Journal Club: How to Make Heat Flow From COLD to HOT
zhlédnutí 7KPřed 5 lety
In this session of the Atoms and Sporks Journal Club we're going to be talking about the paper "Heat flowing from cold to hot without external intervention by using a “thermal inductor”" (Science Advances, Vol. 5, no. 4, eaat9953) which can be found here: advances.sciencemag.org/content/5/4/eaat9953
How Can Light Have Momentum?
zhlédnutí 36KPřed 5 lety
How Can Light Have Momentum?
Boltzmann's Tyranny and Quantum Tunneling: The End of Computing?
zhlédnutí 17KPřed 5 lety
Boltzmann's Tyranny and Quantum Tunneling: The End of Computing?
Holiday Physics: The AMAZING Thermodynamic Properties of Snow and Ice
zhlédnutí 2,4KPřed 5 lety
Holiday Physics: The AMAZING Thermodynamic Properties of Snow and Ice
A&S Journal Club: How DOES That Trillion FPS Camera Work?
zhlédnutí 2,1KPřed 5 lety
A&S Journal Club: How DOES That Trillion FPS Camera Work?
Tours Through Physics: Nanoplasmonics (Part 2), Sensing, Science and Diagnostics
zhlédnutí 12KPřed 5 lety
Tours Through Physics: Nanoplasmonics (Part 2), Sensing, Science and Diagnostics
Tours Through Physics: Nanoplasmonics, Tiny Spheres with BIG Potential
zhlédnutí 26KPřed 5 lety
Tours Through Physics: Nanoplasmonics, Tiny Spheres with BIG Potential
The 2018 Physics Nobel Prize, Part 2: What IS Laser Chirped Pulse Amplification?
zhlédnutí 43KPřed 5 lety
The 2018 Physics Nobel Prize, Part 2: What IS Laser Chirped Pulse Amplification?
The 2018 Physics Nobel Prize: What ARE Optical Tweezers?
zhlédnutí 66KPřed 5 lety
The 2018 Physics Nobel Prize: What ARE Optical Tweezers?
No, Changing Electric Fields DON'T Cause Magnetic Fields; The Real Origin of Electromagnetic Waves
zhlédnutí 128KPřed 5 lety
No, Changing Electric Fields DON'T Cause Magnetic Fields; The Real Origin of Electromagnetic Waves

Komentáře

  • @l.m.892
    @l.m.892 Před 3 dny

    "When I was in high school" tells a lot. A good analogy would be "sending water through a water hose" for a closed or open circuit.

  • @emorytaylor4667
    @emorytaylor4667 Před 9 dny

    Who are you and what degree do you have?

  • @TruePeaceSeeker
    @TruePeaceSeeker Před 9 dny

    You're amazing, thank you 🙏

  • @xzxoxlx
    @xzxoxlx Před 12 dny

    This is an unbelievably great video.

  • @InquilineKea
    @InquilineKea Před 12 dny

    is this a form of surfaced-enhanced raman?

  • @jocelyndryfoos2681
    @jocelyndryfoos2681 Před 15 dny

    Can a mirrored room be designed so that photons from a light absorb and reflect at a rate that prevents radiation pressure expansion while maximizing reflectivity? Hence, one would turn on a light for 1 sec and the room would stay bright for 8 hours before going dark and the room does not break from the pressure

  • @kpk331
    @kpk331 Před 23 dny

    The disputed statement is the stand of Classical electromagnetic field theory. And is backed by Maxwell's equations.

  • @DrDeuteron
    @DrDeuteron Před 26 dny

    So you have a minor mistake at 6:00. If you start moving the negative line charge, it will Lorentz contract and make a negative charge on the “wire”. Rather, you need to accelerate individual charges a la Bells Spaceship Paradox so they remain with constant spacing in the lab frame. This means that in their own frame at speed, they will spread out by the Lorentz factor gamma (the string in the paradox breaks). Moreover in their final rest frame the protons will be contracted by gamma, for a total charge density factor g - 1/g = gamma X beta….which works with the LT of E and B fields.

    • @l.m.892
      @l.m.892 Před 3 dny

      The mistake was to refer to "charges" rather than "charged particles" the source of all electric charges is charged particles.

  • @ladiesman2048
    @ladiesman2048 Před 27 dny

    That's not how you play pinball

  • @dominiqueubersfeld2282

    This guy never learned Maxwell's equations. The first property of Mawxell's Equations is their linearity. Basically if A and B are two solutions of a linear system, then any linear combination of A and B is also a solution. This allows wireless communication. This video is the epitome of the Dunning-Kruger effect.

  • @giovannicicerchia4726
    @giovannicicerchia4726 Před měsícem

    Hi guys. I m searching à men... Thé magnetic comes from the derivative of à sine, which is à cosine. So the maximum of magnetic field come 90° after the max of electric wave. Does somebody understand me? All the internet take the max of E in the same time of the max of magnetic, which is false. Do someone agree? There is two équations which explain derivative E = B and Derivative B=E in the four maxwell équations. Hello.

    • @l.m.892
      @l.m.892 Před 3 dny

      One only need to look at the generation mechanism for light: Lyman, Balmer, Paschen ... To derive what he is trying to explain. The time domain is involved. What he is missing in his explanation of time retardation is the very small distances mean very small times. A light second is approximately 300,000 Km (7.5 times the circumference around the equator, or the approximate distance from Earth to moon). You would need a very large velocity and special sensors to measure this and be accurate.

  • @robertburdge5706
    @robertburdge5706 Před měsícem

    At the very beginning of your video you state that, "Changing Magnetic Fields DON"T Cause Electric Fields". Within this Charge-centric formulation of Maxwell's Equations, what is the mechanism for the induced current in a wire loop when a permanent magnetic is in motion near the wire loop?

  • @honeydavis5568
    @honeydavis5568 Před měsícem

    The better the channel the fewer subscribers. The free power with spark plugs and capacitors gets 10 billion hits

  • @duribv
    @duribv Před měsícem

    You are the one making misconceptions. The acceleration you do at 16:40 actually creates perfect electromagnetic sine waves, but there are multiple of them and this is their sum. Did you ever hear about the Fourier transformation? Your concept works until you get to the quantum mechanic, where charges are picky and do not react with every field they get in contact with.

  • @avinashmulewa
    @avinashmulewa Před měsícem

    keep doing it........

  • @avinashmulewa
    @avinashmulewa Před měsícem

    what an awesome explanation............thank you this really helped me a lot............A big thank you.......

  • @jxnnzm2986
    @jxnnzm2986 Před měsícem

    This is an very good explanation, I've had 2 uni lectures that didnt make it as clear as this video did!

  • @godfreyw5412
    @godfreyw5412 Před měsícem

    This video is gold

  • @TheHaykokalipsis
    @TheHaykokalipsis Před měsícem

    I did not understand it, so its a bad explanation with almost 0 animation of wavey electrons interacting with protons. i am utterly dissapointed at you and myself, but mainly you, because i hate feeling stupid, and your video does not explain the subject enough that i could understand, thus making me feel stupid. How dare you? !

  • @adairjanney7109
    @adairjanney7109 Před měsícem

    So, like most thing they have no clue what they are looking at but pretend like they have it all figured out

  • @Anita95_original
    @Anita95_original Před 2 měsíci

    Is it current or ... dated?

  • @PhysicalScience-vi4nq
    @PhysicalScience-vi4nq Před 2 měsíci

    This is called "Philosophy of Science".

  • @5678plm
    @5678plm Před 2 měsíci

    the real picture is the QED one, all this is classical/vague

  • @stillpointx2623
    @stillpointx2623 Před 2 měsíci

    Anyone know where to find any lectures dealing with nanobubbles with electrostatics? The paper is called Massive generation of metastable bulk nanobubbles in water by external electric fields. I haven't been able to find a video showing how to make these.

  • @dylanmenzies3973
    @dylanmenzies3973 Před 2 měsíci

    Then the obvious question.. can we conceive of a universe without charge but with EM fields. The answer certainly yes because we can find solutions that cover empty space. However physically may be impossible, just as gravity cannot exist without mass-energy.

    • @AlexanderShamov
      @AlexanderShamov Před 14 dny

      As long as our theories only describe local phenomena, we can't really rule out the possibility of fields that aren't "sourced" by anything. GR definitely has no problem with a Ricci-flat world with no matter.

  • @Mcfreddo
    @Mcfreddo Před 2 měsíci

    Yes but in terms of electric current, they are energy waves moving, but there's a charge....

  • @watdanuqta-mf5ms
    @watdanuqta-mf5ms Před 2 měsíci

    Someone on an audio website insists that the electrical current in a power cord permanently affects, changes, undergoes some sort of molecular rearrangement of the dielectric material around it with its interaction with it and refers to it as "burn-in". I could understand that different insulating materials can affect the current through the wire but make permanent changes in the wire?

  • @Out_of-_Box_Thinker
    @Out_of-_Box_Thinker Před 2 měsíci

    Load of hogwash!

  • @puneettripathi740
    @puneettripathi740 Před 2 měsíci

    yes sir we would like to learn the difference between conductors and insulators using quantum mechanics.

  • @manofyhwh
    @manofyhwh Před 2 měsíci

    Thank you! I’ve been trying to understand electromagnetism but the relationship between electric fields, magnetic fields and radiation didn’t make sense intuitively. Now it does. Please keep up the good work by illuminating misconceptions and limitations of conventional explanations.

  • @manofyhwh
    @manofyhwh Před 2 měsíci

    Thank you!

  • @Frank-ie8dh
    @Frank-ie8dh Před 2 měsíci

    Fantastic explanation

  • @havoklad7616
    @havoklad7616 Před 2 měsíci

    Thank you so much man!

  • @5678plm
    @5678plm Před 2 měsíci

    just a rewording of the misconceptions

  • @ELYOUSFIWORLD
    @ELYOUSFIWORLD Před 3 měsíci

    why in 5:20 if light is bent to the left imply that the light have to push the lenz to the right ??

  • @malaraghavan6740
    @malaraghavan6740 Před 3 měsíci

    Awesome explanation for non-physics majors. Thank you! Can you please also explain magnetism diamagnetic, paramagnetic and superparamagnetic in the context of nano magnetism and ferrofluids?

  • @lorisfoucart2475
    @lorisfoucart2475 Před 3 měsíci

    I'm probably making jibberish but I'd like to know why. If we found the frequency of light needed to push off of dark matter or ultrared lights scattered in the universe (or something 😅), could we produce thrust by blasting the said frenquency at it ?

  • @junak777
    @junak777 Před 3 měsíci

    Imagine now Tesla telling us long before 1905 that everything is magnetic potential( voltage,height,accidity etc). That electrons are bubbles. Bubble foam..all that fency words of quantum etc... Wavey MOire. MIura...Moriya, Morin... Memento mori, post mortem. And finally that his machines need no electrons... AMPerage is obsolete. Today we use z-pinch. BAck than Tesla and many other researchers were making very very strong lightnings. Stronger than Venezuela lake. Science uses wire as battery. 1 in 1 out. To explain electricity. Something is destroyed, and later shortcircuited. Tesla distanced wire from magnetic potential. [That distance is Shu as rising EMPty from Ogdoad. Shu ~ cha.] Magnetic potential - charge - ion ..... that is base. EN-ergy is sum of ch-arges. Both charge and energy have gyro within term names. EN illuminates cenote pore hole (indirectly valleytronics) . ENtropy, ENtalphy,penta, entangle, bent vent dent.. Rotation is heat. Angle. Loss. Neutrons giving in fusion all that heat. But in mitochondria heavy water kills en-gine. Tesla was able to place 170 000 V input to get 12 million V of output. Fusion plans to use 50 MWatts to make 500MWatts. Tesla was the 1st who made 1TWatt. Interesting how that works... History hysteresis.. UP DOWN DEN SITY. To Tesla vibration was father tri-dent to all. O-OOO Ψ Other names. Standing ovations, B o-sci-llations,diSTurBance. STate taSTe. [ance ~ anda... cenote resonance = r-nose-ance anda = duMMB eL-Lip-soid, 2 of..(p)repel +++ reBel..Helice and Bobbin around the ring of fire] 1) To wave or pitch or fre34=5qu-ency or rate or proportion or back-forth to carrier , medium, field. 2) To transfer of en-ergy. Holes and permeability as hole conNECTivity neST. Or MoMentum. 3) To matter. It is interesting how dishonest teachs pour down "knowledge" to cover lack of spiritual eye. For instance lightning is not up down motion. It is SATURatioN. Sideways. Like the Avatars head arrow. Anyways thanks a lot. I hope I was not boring. Those indents, gaps are source to blue red shift phase face facet genus. Clusters bands. LayeRing. Blue is wider. Red closer. Doppler doppelganger rainBow.Superconductance... walls.. Archeology remembers White Bee. To me hexa -gon -mer is important gap to white light. Also hexagon net is energy web. Dodecahedron yellow path is interesting video. New scalar physics too. It would be interesting to make video, comparation among water, light and glass. Granular surface tension is up down and differs to Chladni.

  • @jorgerive7335
    @jorgerive7335 Před 3 měsíci

    this is different than how I was taught physics! it'll take a while to digest. Thank you.

  • @johnnywilliams2641
    @johnnywilliams2641 Před 4 měsíci

    I thought light was waves and particles, the wave particle duality. What kind of hogwash did you just rattle my last neuron with, you refuse center troll you.

  • @RocketScientistNuvo
    @RocketScientistNuvo Před 4 měsíci

    Excellent video! I hope you will do one on optical computing. Going from 2-4GHz to 200,000-400,000 GHz optical frequencies would be great, but how does that work? Also, how does light work at very small sizes?

  • @user-ml2mg6vc1r
    @user-ml2mg6vc1r Před 4 měsíci

    I started getting addicted to your videos, thank you so much for the clear explanation.

  • @imnewtothistuff
    @imnewtothistuff Před 4 měsíci

    Wrong... There are no separate positive and negative charge particles,they do not exist. There is only charge and discharge.

  • @dosesandmimoses
    @dosesandmimoses Před 4 měsíci

    Probably a dumb question.. I’m learning so my apologies if it’s a bit ignorant.. but Is infinity an assumption? That’s a very specific term.. that’s why I ask. Is there proof of infinity? Thanks for your reply and patience with my question and/or ignorance.

  • @Ogoun-grandson
    @Ogoun-grandson Před 4 měsíci

    im real upset that i didnt get to learn this in high school. but at least im making up for lost time so thank you so much for making this video

  • @somerandomboi8239
    @somerandomboi8239 Před 4 měsíci

    Wait do electrons accelerate as they advance down the wire? How come current (I) retains the same value along the circuit then? (or is that just in theory and in reality it would be slightly higher near the positive end? I mean objects have greater velocity as they get closer to the ground. I've never thought about electrons this way, please help lol.)

  • @tonypalmeri722
    @tonypalmeri722 Před 4 měsíci

    THANK YOU! You're confirming several of the conclusions I had already come to (no help from standard E&M textbooks, or so many other physics videos).

  • @halfisher3598
    @halfisher3598 Před 4 měsíci

    Wait, current doesn’t cause fields? Please don’t tell my model 3 that, i need it to get me to work! XD

  • @harleyquinn8202
    @harleyquinn8202 Před 5 měsíci

    How do retarded potentials explain that electromagnetic waves can be blocked or reflected?

  • @cakemoss4664
    @cakemoss4664 Před 5 měsíci

    I have heard in the past that the magnetic field is the relativistic correction to the electric field. Does this sound correct?

    • @AlexanderShamov
      @AlexanderShamov Před 14 dny

      In relativistic physics the electric field makes no sense on its own. For example, it can be zero in one coordinate system and nonzero in another. So the electric field strength is not an invariant quantity, but if you also add the magnetic component, it becomes invariant. This is similar to how the spatial coordinates and time don't make sense on their own, but acquire invariant geometric meaning when taken together, or how energy is not invariant on its own, but energy-momentum is.