Effects of electron-electron scattering on electron-beam propagation in a two-dimensional electron gas
Effects of electron-electron scattering on electron-beam propagation in a two-dimensional electron gas
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电子-电子散射对二维电子气中电子束传播的影响
DOI：
10.1103/physrevb.62.2057
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发表时间：
2000
影响因子：
3.7
通讯作者：
A. V. Yanovsky
中科院分区：
文献类型：
--
作者：
H. Predel;H. Buhmann;L. W. M. R. Gurzhi;A. Kalinenko;A. I. Kopeliovich;A. V. Yanovsky
我们从实验和理论上研究了电子-电子碰撞对二维电子气体中从零到费米能量的过量注入能量对电子束传播的影响。我们发现探测器信号由准粒子电子组成，这些电子要么没有发生任何电子-电子碰撞，要么只是以小角度散射。从理论上讲，小角度散射表现出明显的特征，可以追溯到电子系统的降维。讨论了一些非线性效应，也与系统的二维特性有关。在最简单的情况下，电子束的高能部分对电子气体的加热导致准粒子电子信号的减弱，并导致热电压的出现。这导致探测器信号对注入光束强度的非单调依赖，正如实验观察到的那样。
We have studied experimentally and theoretically the influence of electron-electron collisions on the propagation of electron beams in a two-dimensional electron gas for excess injection energies ranging from zero up to the Fermi energy. We find that the detector signal consists of quasiballistic electrons, which either have not undergone any electron-electron collisions or have only been scattered at small angles. Theoretically, the small-angle scattering exhibits distinct features that can be traced back to the reduced dimensionality of the electron system. A number of nonlinear effects, also related to the two-dimensional character of the system, are discussed. In the simplest situation, the heating of the electron gas by the high-energy part of the beam leads to a weakening of the signal of quasiballistic electrons and to the appearance of thermovoltage. This results in a nonmonotonic dependence of the detector signal on the intensity of the injected beam, as observed experimentally.