Solid State Physics in a Nutshell: Topic 5-1: Introduction to Phonons

We begin today with a one dimensional crystal and we treat the bonds between the atoms as springs. We then develop an expression for the force acting on one particular atom. Using a plane wave approximation for the displacement we then develop an equation relating the wave vector and the frequency of oscillation.

[@bluntfist]

Tip to anyone watching: use this as supplementary to whatever classwork/reading you're doing. Not super helpful for people completely fresh to the subject, but definitely helps cement ideas for those who were exposed to the subject in the past few days (at least that's my experience). Other than the video being a little too fast, my only real complaint about is that you draw your question marks from the bottom up and that's weird.

[@kuntiechan]

Bluntfist Do you have any suggestions where I can watch lectures about Phonons? I’ve tried it here on KZbin as well as edx org and MIT OCW but I havent found one that directly tackles it via Kittel

[@nidhishsharma9471]

@@kuntiechansame, i'm lost

[@ItsSebBro]

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

[@taka-taktak]

Awesome. Thank you for this.

[@swagner-astro]

the thoughtspeed is usually as high as the writing speed. This video is way to quick! I'm not a beginner but couldn't concentrate or understand. Those 2 voices combined with the writing is just way too much input. If it was slower i guess the tutorial would be really good! (although i don't like the fact that the Eric dude knows everything and poor Nicole is only guessing some things right)

[@yashcherivirala]

Where do you mention phonons in this video ?

[@pancakes465]

Yaswanth Kumar Cherivirala when they mentioned the displacement as a traveling wave, that was the phonon

[@sufyanramzan6773]

its too hard to catch up for beginners , writing is too speedy :(

[@matrixate]

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.

[@kkm5384]

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]

It's for people who are studying physics at university.