Introduction to Solid State Physics, Lecture 5: One-dimensional models of vibrations in solids

[@solounomas0]

This is quite understandable!! Here physics major dealing with solid state physics

[@1986Godfrey]

The BEST!! Thank you sir!

[@tenthousandone7372]

Thank you professor! I'd like to ask what is the energy of a phonon? Is it hw or hw(n+1/2)?

[@mahmoudmaher00]

It's hw, see 48:45

[@Neeraj-is1jt]

@@mahmoudmaher00 in 44:26 he said that energy of each phonon is (n+1/2)hw

[@Neeraj-is1jt]

In 13:49 can someone tell me that "w" is the frequency of vibration of a particle or the frequency of a wave??

[@GiorgiAptsiauriX]

Your lectures are much better than Oxford ones by Dr. Simon. He goes way too fast and skips a lot of details assuming his students know all that shit. I am taking this class as someone who studies master's in electronics and I have 0 background in quantum mechanics, so for me there are a lot of unknowns here. But your lectures help more than his.

[@MaryamMful]

Each mode is its own linear harmonic oscillator and for each mode there are n eigenstates. In principle eigenstates are modes too. If there are N natural modes, there must me n times N modes. Is that right? I didn't really understand how you could differ between eigenstates and modes. Except maybe the latter are "natural" modes and eigenstates are excited modes.

[@matrixate]

Superb lecture. I would have liked a little more clarity about what makes the dispersion relationship between photons and optical phonons. Regardless, a fantastic job.

[@themasstermwahahahah]

the super high pitched whine in this audio is unfortenately really annoying, becuase these lectures are really good

[@Learndiyphysics]

very informative!

[@tarrytao7508]

slides are really good..

[@abhinavdhull1431]

does anyone have his notes?

[@nikhilsen9007]

How does the spring constant K and wave vector k are related ? during the lecture you have suddenly jumped from k(spring constant) to k(wave vector). Why?

[@moscademuletas]

spring constant is actually KAPPA (GREEK LETTER K a bit different) and wave vector is k! k comes from the wave function only!

[@aiswaryapriyambada2757]

can i get the slides please

[@yurio00]

No sé inglés 😭