TAILIEUCHUNG - Báo cáo " Acoustomagnetoelectric effect in a superlattice "

The acoustomagnetoelectric (AME) 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) . The analytical expression for the AME current $j^{AME}$ is calculated in the case of relaxation time of momentum $\tau$ is constant approximation. The result indicates that the existense of $j^{AME}$ in a SL may be due to the finite gap band , and the periodicity of the electron spectrum along the SL axis. Numerical calculations have been. | VNU Journal of Science Mathematics - Physics 25 2009 131-136 Acoustomagnetoelectric effect in a superlattice Nguyen Quang Bau1 Nguyen Van Hieu1 Nguyen Thi Thanh Huyen1 Nguyen Dinh Nam1 Tran Cong Phong2 Faculty of Physics College of Science VNU 334 Nguyen Trai Thanh Xuan Hanoi Vietnam 2 Hue University of Education 32 Le Loi Hue Vietnam Received 10 July 2009 Abstract. The acoustomagnetoelectric AME effect in a superlattice SL is investigated for an acoustic wave whose wavelength À 2 Tr g is smaller than the mean free path I of the electrons and hypersound in the region ql 1 where q is the acoustic wave number . The analytical expression for the AME current jAME is calculated in the case of relaxation time of momentum T is constant approximation. The result indicates that the existense of jAME in a SL may be due to the finite gap band and the periodicity of the electron spectrum along the SL axis. Numerical calculations have been done and the result is analysed for the GaAs AlAs SL. All the results are compared with the normal bulk semiconductors both theory and experiment in the weak magnetic field region to show the difference. 1. Introduction It is well known that when an acoustic wave propagates through a conductor it is accompanied by a transfer of energy and momentum to the conducting electrons. This gives rise to what is called the acoustoelectric effect. The study of acoustoelecric effect in the bulk semiconductor has received a lot of attention l-4 . Recently Mensah has investigated this effect in a superlattice 5 and there has been a growing interest in observing this effect in mesoscopic structures 6-8 . However in the presence of the magnetic field the acoustic wave propagating in the conductor can produce another effect called the acoustomagnetoelectric AME effect. The AME effect is creating an AME current if the sample is short circuited in the Hall direction or an AME field if the sample is open when a sample placed in a magnetic field H carries an .

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