论文标题
在退化的2D电子气体中诱导的磁性振荡诱导的磁振荡
Magnetoconductivity oscillations induced by intersubband excitation in a degenerate 2D electron gas
论文作者
论文摘要
理论上研究了磁性振荡和由退化多个带二维电子系统中激发子带的非平衡种群引起的绝对负电导率。假定无法通过单个费米水平来描述电子分布，这可能是由谐振微波激发或任何其他原因引起的平衡位移。在这种情况下，除了出现在Shubnikov-de HAAS条件下的众所周知的电导率峰以及正常带间带散射的小峰外，还可能证明具有不同形状的标志变化振荡。我们还发现，即使是转移到激发子带的一小部分电子也会导致负电导率效应。
Magnetoconductivity oscillations and absolute negative conductivity induced by nonequilibrium populations of excited subbands in a degenerate multisubband two-dimensional electron system are studied theoretically. The displacement from equilibrium, which can be caused by resonant microwave excitation or by any other reason, is assumed to be such that electron distributions can no longer be described by a single Fermi level. In this case, in addition to the well-known conductivity peaks occurring at the Shubnikov-de Haas conditions and small peaks of normal intersubband scattering, sign-changing oscillations with a different shape are shown to be possible. We found also that even a small fraction of electrons transferred to the excited subband can lead to negative conductivity effects.
