The influence of external electric field on acoustoelectric effect in a superlattice
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Date
2005-02
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Volume Title
Publisher
Superlattices and Microstructures
Abstract
The de acoustoelectric current jac induced by the interaction of acoustic phonons with the conducting electrons is calculated. The calculation is done in the hypersound regime where qℓ ≫ 1 (here q is the acoustic phonon number and t is the electron mean free path). The electric field consists of dc field E0 and a low frequency alternating field E1. A nonlinear dependence of jac on E0 and E1 is observed. Depending on the direction of the dc field E0 the acoustoelectric current can either be positive or negative. At ωq = 1011 s-1 and in the absence of E0, Jac is very small and tends to zero at E1 = 1.3 × 105 V m-1. Further increase of ωq from 1011 s-1 sees a dramatic shoot "up" of Jac. Lastly the acoustoelectric currrent in the presence of E0 is modulated by E1. © 2004 Elsevier Ltd. All rights reserved.
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Keywords
Acoustoelectric current, Acoustoelectric effect, Boltzmann kinetic equation, Superlattice, Surface acoustic waves