So i don't really understand why the change in momentum of a crystal involves a reciprocal lattice vector. Surely it is just the change in momentum due to the change in the number and frequency of the phonons before and after whatever event/scattering/collision takes place. Can somebody please explain this to me in as analogous to classical mechanics way as possible, not just a purely mathematical explanation please. I'm not proficient with Fourier transformations momentum spaces etc. Thanks ;)(adsbygoogle = window.adsbygoogle || []).push({});

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# Why is the change in momentum of a crystal include reciprocal lattice vectors?

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