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

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Upper-level undergraduate course taught at the University of Pittsburgh in the Fall 2015 semester by Sergey Frolov.
The course is based on Steven Simon's "Oxford Solid State Basics" textbook.
Video is available in HD, make sure to adjust the youtube settings accordingly.

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

solounomas

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.

GiorgiAptsiauriX

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

themasstermwahahahah

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.

matrixate

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

tenthousandone

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.

MaryamMful

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

Neeraj-isjt

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?

nikhilsen

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