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Tunneling Phenomena in Solids
We know from Bloch's theorem that the wave function ψ of an electron in a semiconducting or insulating crystal can be written where k is the wave vector of the state and u(x) is a periodic function with the lattice period of the crystal. Over reasonable distances the u(x) part of the function averages out, and we can view the propagating part e ikx as a quasi-particle behaving in much the same way as a particle in free space. The dynamics of this particle are given by the dispersion relationdoi:10.1007/978-1-4684-1752-4_9 fatcat:d2avuhsb3rcqtocz7lfnrsutwa