Question: Show that the Wannier functions centered at different lattice sites are orthogonal, that is, [ r G Rm)n G Rm ) = 8nx'8mm - -

Show that the Wannier functions centered at different lattice sites are orthogonal, that is,[ r G Rm)n G Rm ) = 8nx'8mm - - (1.9.11)

[ r G Rm)n G Rm ) = 8nx'8mm - - (1.9.11)

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