No wonder you have limited views and way too low subscriptions.

Very good explanation if you have basic quantum physics knowledge.

prerequisites?

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?

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.

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??

Amazing 😍😍

i hope you live a happy long life

Yall are life savers!!

Awesome. Thank you for this.

Can someone explain what is the meaning of a k point?

For anyone searching for the reference at 5:56 it is video 5-4

what phonon? You didn't even introduce phonons!

which one of them will be group velocity....well what do think?? Really?

sound of the video pretty messed up

at time 1:46, isn't the exponent for fermi energy supposed to be 2/3 NOT 3/2?

Hi, great video. Can you give the graph references? Please.

that was great! Thank you. I think i finally got it

great job!

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

nice video.. unfortunately i don't have enough knowledge background to understand =(

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!

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.

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.

This is so dumb... I don't even get the idea...and u removd everything

This topic is driving me crazy

NOt a good way to explain

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.

Is this inspired by sheldon and amy?

wait this is not vampyr graphics settings

Didn't like the time jump ):

Thank you so much for this. I have an incoming exam. This helps a lot.

hard to understand

Why in harmonic approximation free path particle is infinity

Noooo, is the mobility video private??

Do you have the answers to those questions?

Too fast. Annoying.

Thanks for the nice informative and concise video. On 1:17, is the power at the last term of last equation ok?

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?

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?

Nice sir Nice madam.. Please do u explain thuoroghly please!

This was very helpful. thanks a bunch :)

How would you get the Kmin?

I was wondering how at min @, you went from having C_k in the potential term to C_(k-G). Thank you!

How do phonons interact with photons? and how does the Raman spectra relate to the phononic band structure?

Dear sir and madam how we can take the data from bandstructure to calculate the effective mass of specific material?

thank u so much, maybe you save my exam!!

I LOVE THIS CHANNEL !!!

A really fantastic channel to supplement your learning, you do need to have some other sources but this is fantastically explained

😍