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Often, professors upload specific chapters or problem sets from Kittel. You will not find the full 300-page book here, but you will find the "best" solutions and supplements, which are arguably more valuable for learning.
Quantization of lattice vibrations and electromagnetic fields in solids. Electron Interactions: quantum theory of solids kittel pdf best
Whether you are preparing for a PhD qualifier or just curious about the quantum world, Kittel’s Introduction to Solid State Physics is the most authoritative guide you can have on your digital or physical shelf. Often, professors upload specific chapters or problem sets