No wonder you have limited views and way too low subscriptions.
@tristanwegner3 ай бұрын
Very good explanation if you have basic quantum physics knowledge.
@k.k.skesava75615 ай бұрын
prerequisites?
@TheIndolence9 ай бұрын
Great video thanks! The elephant in the room for me is that when we talk about propagation of phonons we imagine that on the right-hand side (cold), something is different than on the left (hot). There is a thermal energy propagating. But we use a plane-wave model where the phonon is completely delocalized. Is there a simple analogy to bring the two notions (particle/waves) together? Would a wavelet decomposition help? Or some other description?
@ankidokolo9 ай бұрын
Some updates are needed, I think. Einstein's model does the job for the optical phonons branch of the dispersion relation. For the acoustic branch, then yeah, you gonna need Debye.
@MistressGlowWorm10 ай бұрын
Aaaaaahhhh!! I'm so torn! I am torn between Materials Physics (Solid State Physics) Solid State Chemistry, Physical Chemistry. This is really helping me sort it out but I swear for my entire life Ill be involved in all. Now to find the best PhD programs. Someone chime in. Who has gone all in and what are your thoughts??
@MistressGlowWorm10 ай бұрын
I smashed the subscribed button BTW. School doesn't know what to do with me. They're like pick between Chemical Engineering and Physics... Like its that easy to choose -.-
@LOKANKSHASUKTELPHYSICS Жыл бұрын
Amazing 😍😍
@marilinemonteiro3336 Жыл бұрын
i hope you live a happy long life
@Plams5 Жыл бұрын
Yall are life savers!!
@taka-taktak Жыл бұрын
Awesome. Thank you for this.
@asaf2323 Жыл бұрын
Can someone explain what is the meaning of a k point?
@ProfessorKInGkiWI2 жыл бұрын
For anyone searching for the reference at 5:56 it is video 5-4
@sayandebnath64452 жыл бұрын
what phonon? You didn't even introduce phonons!
@sayandebnath64452 жыл бұрын
which one of them will be group velocity....well what do think?? Really?
@sayandebnath64452 жыл бұрын
sound of the video pretty messed up
@eliesermejia552 жыл бұрын
at time 1:46, isn't the exponent for fermi energy supposed to be 2/3 NOT 3/2?
@filipecorreia-profissional62432 жыл бұрын
Hi, great video. Can you give the graph references? Please.
@1987joey19872 жыл бұрын
that was great! Thank you. I think i finally got it
@sathvikmalgikar28422 жыл бұрын
great job!
@m-1082 жыл бұрын
awessssssssssssommmmmmmmmmmmmmmme. i am a physics student. it really helped me. kindly also make such video series for Nuclear physics and Atomic & Particle physics. Humble request
@renatoberaldo23352 жыл бұрын
nice video.. unfortunately i don't have enough knowledge background to understand =(
@tomasgerasimidis4823 жыл бұрын
All the formalism with translation by 2pi/a was messing with my head and I couldn't see how a random geometric unit cell contained all the answers. "Wavelengths shorter than the atomic spacing carry no physical meaning" (paraphasing) is what gave me the "Uh huh!" moment. Thank you!
@kkm53843 жыл бұрын
too fast. and cartoon animation type way of explanation is bit beyond my brain to grasp as new learner. i think this is not for beginners.
@taka-taktak Жыл бұрын
It's for people who are studying physics at university.
@shuewingtam62103 жыл бұрын
Your video is going so fast. Without repeated back and forth viewing, i could not catch up your derivation shown in video. Anyway, your work is well done.
@itfanizam3 жыл бұрын
This is so dumb... I don't even get the idea...and u removd everything
@commonindianbirds2233 жыл бұрын
This topic is driving me crazy
@ramysaad10473 жыл бұрын
NOt a good way to explain
@matrixate3 жыл бұрын
Yea, I have to agree with others on all your videos. The talking is a bit too fast on SOME things...AND you're out of sync which makes the information useless unless you're using this as a refresher especially at this part 4:30 where you mention 'these atoms experience positive displacements and these atoms experience positive displacements." I think I get it, but that isn't the point. When you studied this, were you shown out of sync information? I don't think so...so why do you speed through this? Wasn't the purpose to teach and not to confuse? Also, show how you get results.
@shankard5733 жыл бұрын
Is this inspired by sheldon and amy?
@J42Michael3 жыл бұрын
lol fun with flags style?
@sayandebnath64452 жыл бұрын
amy was dumb uncle! These are professionals
@pbkrogen653 жыл бұрын
wait this is not vampyr graphics settings
@HornWilliam3 жыл бұрын
Didn't like the time jump ):
@christianmaestre1113 жыл бұрын
Thank you so much for this. I have an incoming exam. This helps a lot.
@juefeiyang52814 жыл бұрын
hard to understand
@valeriaitzelarteagamuniz52864 жыл бұрын
Why in harmonic approximation free path particle is infinity
@Foomaster294 жыл бұрын
Noooo, is the mobility video private??
@Foomaster294 жыл бұрын
Do you have the answers to those questions?
@AbdolazimHasseli4 жыл бұрын
Too fast. Annoying.
@happyworld18494 жыл бұрын
Thanks for the nice informative and concise video. On 1:17, is the power at the last term of last equation ok?
@mariusneugschwender25044 жыл бұрын
why does the doped Silicon not share the same curve for low temperature like the natural? Your explanation with the long wavelength, that does not see the defects should hold there too?
@janalbrecht50995 жыл бұрын
that doesnt make much sense, when the phonons hurt the rule of momentum conserved by the umlapp-process, why its not forbidden? where does the losing momentum goes?
@onlyphysics1435 жыл бұрын
Nice sir Nice madam.. Please do u explain thuoroghly please!
@elahehakhoundi75705 жыл бұрын
This was very helpful. thanks a bunch :)
@xgozulx4 жыл бұрын
Did you meant...thanks a BLOnCH I had to xD
@gadgr8gr85 жыл бұрын
How would you get the Kmin?
@irenevillarrodriguez6225 жыл бұрын
I was wondering how at min @, you went from having C_k in the potential term to C_(k-G). Thank you!
@gadgr8gr85 жыл бұрын
How do phonons interact with photons? and how does the Raman spectra relate to the phononic band structure?
@rzkhan12745 жыл бұрын
Dear sir and madam how we can take the data from bandstructure to calculate the effective mass of specific material?
@Hanif-yc6jj2 жыл бұрын
you can use discrete numerical method for taking derivative of given data
@Oshibananen5 жыл бұрын
thank u so much, maybe you save my exam!!
@ramiromillanfraile73995 жыл бұрын
I LOVE THIS CHANNEL !!!
@ItsSebBro5 жыл бұрын
A really fantastic channel to supplement your learning, you do need to have some other sources but this is fantastically explained