Solid State Physics in a Nutshell: Week 10.1 Bloch theorem and Central equation

[@XWurstbrotX]

People actually made effort for their students. My professor literally copied (and translated) the Solid State Physics book of Gross and Marx. We ran through half of the book (500 pages) in 4 months and i attended every lecture but didn't understand it. These videos make things much clearer, thanks!

[@dbkwow]

First,When I watched this I got so confused but then I looked at my notes, wrote everything again and while writing I realized what you were talking about in your video. Now that I am watching it again , I understand everything . Thanks !!

[@ashutoshsingh3237]

excellent review

[@irenevillarrodriguez622]

Hi, I was wondering how at min 4:55, you went from having C_k in the potential term to C_(k-G). Thank you!

[@thiagohenriquer.dacunha4402]

Thank you for your clear and helpful explanation

[@NGBigfield]

Your Videos are awesome!

[@leetingfung]

How does that in the central equation, k' is replaced by k in the k.e. term but k' is k-G in the potential term? Doesn't that mean the k satisfying the Bragg condition is different for k.e. and potential? Have been struggling this for few days:(

[@erictoberer4874]

Lee ting, can you point me to the time stamp?

[@leetingfung]

So at 4:40, k'=k is deduced from the delta function, and that is how we get the e^0 in the k.e. part of the Hamiltonian, and I expect we have to use k'=k for the potential part as well. But in the central equation (5:17), it is k=k'-G rather than k=k'.

[@ИльяБалякин-м5ш]

@@leetingfung i'm not sure if its useful for you now, but may be for others:) we will have non-zero element in the sum if in the exponent terms multipliers before r will have the same module, but different signs: for the 1st sum it is possible if k=k', but for the second it is possible if k+G=k', or k=k'-G.

[@jermiinus]

What book does the page numbers refer to?

[@erictoberer4874]

Kittel, version 8

[@sandeepmunjal1]

Thanks ... :)

[@MrOmbro]

Damn that was good

[@marcofrau2318]

nice but I found it going really too fast

[@erictoberer4874]

Fair! These are designed to be watched 2-3 times in a row. Round 1: broad overview, ignore the math details, Round 2: watch slowly, use the pause to figure out the math, Round 3: put it all together.

[@mfoucault1984]

@@erictoberer4874 great job Eric, this is very good material!

[@poypipay9505]

Thank u.. anyway why don’t you put the coffee on the stove😛😛😛 ..eric