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.
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.
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.
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?
This is quite understandable!! Here physics major dealing with solid state physics
The BEST!! Thank you sir!
In 13:49 can someone tell me that "w" is the frequency of vibration of a particle or the frequency of a wave??
Thank you professor! I'd like to ask what is the energy of a phonon? Is it hw or hw(n+1/2)?
It's hw, see 48:45
@@mahmoudmaher00 in 44:26 he said that energy of each phonon is (n+1/2)hw
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.
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.
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.
very informative!
does anyone have his notes?
the super high pitched whine in this audio is unfortenately really annoying, becuase these lectures are really good
slides are really good..
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?
spring constant is actually KAPPA (GREEK LETTER K a bit different) and wave vector is k! k comes from the wave function only!
can i get the slides please
No sé inglés 😭