The Nonlinear Acoustoelectric Effect in a Superlattice

Nguyen Quang Bau, Nguyen Van Hieu, Nguyen Thi Thuy, Tran Cong Phong

Abstract


The acoustoelectric effect in a superlattice (SL) is investigated for an acoustic wave whose wavelength $\lambda =2\pi/ q$ is smaller than the mean free path $l$ of the electrons and hypersound in the region $ql\gg1$. (where $ q$ is the acoustic wave number) . A nonlinear dependence of the acoustoelectric current $j^{ac}$ on the constant electric field $E$ is obtained by using the classical Boltzmann kenetic equation. The analytical expression for the acoustoelectric current $j^{ac}$ is calculated for constant of momentum relaxation time. Numerical calculations is done, and the result is discussed for a typical GaAs/AlGaAs SL. It is noted that when the electric field is negative the current $j^{ac}$ decreases, reaches a minimum and rises. On the other hand, when the electric field is positive the current increases, reaches a maximum and then falls off. A similar observation has been noted for an acoustoelectric interaction in a multilayered structure resulting from the analysis of $Si/SiO_{2}$ structure. The dominant mechanism for such a behavior is attributed to the periodicity of the energy spectrum of electron along the SL axis.

Full Text:

PDF


DOI: https://doi.org/10.15625/0868-3166/20/3/2278 Display counter: Abstract : 43 views. PDF : 28 views.

Refbacks

  • There are currently no refbacks.




Editorial Office:

Communications in Physics

1st Floor, A16 Building, 18B Hoang Quoc Viet Street, Cau Giay District, Hanoi, Vietnam

Tel: (+84) 024 3791 7102 

Email: cip@vjs.ac.vn

Copyright by