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Solid-state physics studies how macroscopic properties of solids (mechanical, electrical, optical, etc.) result from their microscopic structure. It usually deals with the scale where quantum properties of the particles are substantial.

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Energy Mean Value of Quantum Gas

At low temperatures ($\beta\to\infty$) the partition function is dominated by the ground state and the average energy should be the ground state energy. This should be correct when taking the limit on …
Yarden Sheffer's user avatar
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Attractive interaction in BCS theory

The common way to discuss BCS superconductivity, as I have seen in several books, is to assume that we have a Fermi liquid, on top of which we add an interaction of the form $$H_{int}=\sum_{p,p^\prime …
Yarden Sheffer's user avatar
3 votes
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Are self-consistency arguments logical/rigorous? An example with Pauli paramagnetism

The gist of such self-consistent is the (implied) assumption of a unique solution. If we indeed have a unique solution then the self-consistent solution we find under certain assumptions is indeed the …
Yarden Sheffer's user avatar