多子带二维电子系统中微波共振诱导的磁振荡和电阻态消失
Microwave-resonance-induced magnetooscillations and vanishing resistance states in multisubband two-dimensional electron systems
摘要：
本文描述了共振微波辐照下液氦表面多子带二维电子系统的直流磁导率，并利用自洽玻恩近似研究了负线性响应电导的新机制。考虑了两种散射体（蒸气原子和毛细波量子）。除了附近的点，其中子带间跃迁的激发频率与回旋频率相称的电导率调制预期，一个符号变化的校正的线性电导率示出出现通常的准弹性子带间散射，如果朗道能级的碰撞加宽是远远小于热能。衰变加热的电子系统附近的易磁化点导致磁振荡的电子温度，这被证明是增加的重要性的符号变化的校正。在较宽的温度和磁场范围内，计算得到的磁导率振荡的线形与实验观测结果吻合较好。
英文摘要：
The dc magnetoconductivity of the multisubband two-dimensional electron system formed on the liquid helium surface in the presence of resonant microwave irradiation is described, and a new mechanism of the negative linear response conductivity is studied using the self-consistent Born approximation. Two kinds of scatterers (vapor atoms and capillary wave quanta) are considered. Besides a conductivity modulation expected near the points, where the excitation frequency for inter-subband transitions is commensurate with the cyclotron frequency, a sign-changing correction to the linear conductivity is shown to appear for usual quasi-elastic inter-subband scattering, if the collision broadening of Landau levels is much smaller than thermal energy. The decay heating of the electron system near the commensurability points leads to magnetooscillations of electron temperature, which are shown to increase the importance of the sign-changing correction. The line shape of magnetoconductivity oscillations calculated for wide ranges of temperature and magnetic field is in a good accordance with experimental observations.
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