Even electrical conductivity in piezoelectrics with streaming; separation of the shift and ballistic contributions
Ivchenko E. L. , Pikus G. E.
Possible mechanisms are discussed for the current which is even in the field in crystals lacking a center of inversion. It is shown that in crystals with a degenerate band under streaming conditions this current results primarily from a shift mechanism, i.e., from a displacement in г space of the current carriers upon quantum transitions.