159 elements only between states which differ in one of the
single-electron wave functions, in short, HeR induces only
one-electron transitions. The matrix elements 1mn and Pmn reduce to
matrix elements between the single-electron wave functions. We are
interested primarily in crystalline solids for which the band model
is a good approximation. The Bloch single-electron wave function in
this model has the form: N'I ili-';; U. r.;;) ( (1.14) ""nk r, =e
nh\r , where n is the band index and U (r) has the periodicity of
the lattice. The form of the Bloch function follows from the
translational symmetry of the crystal, and the matrix elements
between Bloch states are subject to the condition of wave-vector
conservation: k'=k, for
General
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