Resonant tunnelling in parabolic quantum well structures under a uniform transverse magnetic field
Gong Jian (宫箭)a, Liang Xi-Xia (梁希侠)ab, Ban Shi-Liang (班士良)ab
a Department of Physics, College of Sciences and Technology, Inner Mongolia University, Hohhot 010021, China; bCCAST (Word Laboratory), Beijing 100080, China
Abstract The resonant tunnelling through parabolic quantum well structures under a uniform transverse magnetic field is investigated by a simple numerical method. Numerical results of the transmission coefficient are obtained for several GaAs--AlxGa1-xAs parabolic well structures. It is found that the resonant peaks shift towards the higher energy region as the magnetic field increases, and some new resonant peaks emerge when the magnetic field becomes stronger. The J-V characteristics of a parabolic quantum well are discussed for the cyclotron centre located at different positions. It is also found that the cyclotron centre located at the parabolic well centre is helpful to explain the experiment, and the peak current densities decrease and shift to higher bias with the increase of magnetic field. The influence of mixed crystal effect on the J-V characteristic under a uniform transverse magnetic field is also investigated.
Received: 28 May 2004
Revised: 16 September 2004
Accepted manuscript online:
Fund: Project supported partly by the National Natural Science Foundation of China (Grant No 10164003) and the Foundation for University Key Teachers by the Ministry of Education (Grant No GG-140-10126-1005)
Cite this article:
Gong Jian (宫箭), Liang Xi-Xia (梁希侠), Ban Shi-Liang (班士良) Resonant tunnelling in parabolic quantum well structures under a uniform transverse magnetic field 2005 Chinese Physics 14 201
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