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I am a bachelor student and I started studying topology and I came across two terms I have never seen before: Bulk band structure and bulk states.

Can someone explain these two terms or provide me a reference where I can check? Everything I found on the internet is for people who already know what are they.

thanks

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The bulk states are the quantum states of electron inside the volume (bulk) of a crystal, obtained from Schrödinger equation. These states are usually labeled by the two indices, n and k representing respectively the band index and wave number. The plot of the energy of these states versus k for various values of n is called bulk band structure. In contrast to bulk states are edge states, which are localized on the surface (boundaries) of crystal and not in the bulk.

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