Theory of magneto-oscillation effects in quasi-two-dimensional semiconductor structures
Theory of magneto-oscillation effects in quasi-two-dimensional semiconductor structures
复制标题
准二维半导体结构中的磁振荡效应理论
DOI：
10.1088/0953-8984/13/11/309
复制
发表时间：
2001
期刊：
影响因子：
--
通讯作者：
M. Willander
中科院分区：
文献类型：
--
作者：
N. Averkiev;L. Golub;S. Tarasenko;M. Willander
本文发展了一个二维结构的动力学系数磁振荡理论。计算了多级系统的绿色函数，考虑了零温度和非零温度下中等磁场中的子带间散射。研究了Shubnikov-de哈斯效应的温度依赖性。它示出的振荡频率成正比的浓度在上子带出现，即使占领这个子带是低的。对于第一次，没有热阻尼的电导率磁振荡的振幅进行了计算。结果表明，它们的频率与尺寸量子化能量的差异成正比。预测了在上子带占有率较小的情况下，导磁率拍频的出现和消失。
A theory of magneto-oscillations of kinetic coefficients is developed for two-dimensional structures with several occupied size-quantized subbands. The Green function of a multilevel system is calculated, making allowance for intersubband scattering in moderate magnetic fields at both zero and non-zero temperatures. The temperature dependence of the Shubnikov-de Haas effect is investigated. It is shown that oscillations with frequency proportional to the concentration in the upper subband appear even if occupation of this subband is low. For the first time, the amplitude of the conductivity magneto-oscillations that are not thermally damped out is calculated. It is shown that they have frequencies proportional to the differences of the energies of size-quantization. It is predicted that there will be emergence and disappearance of beats in the magnetoconductivity at relatively small occupation of the upper subband.