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arXiv 0810.2014cond-mat.mes-hall
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直流驱动二维电子系统分数微波感生磁阻振荡的非线性理论

Nonlinear theory of fractional microwave-induced magnetoresistance oscillations in a dc-driven two-dimensional electron system

X. L. Lei

摘要:

利用电流直接控制的多光子辅助输运方案研究了直流驱动二维电子系统中微波诱导的非线性磁电阻效应。结果表明,在回旋共振二次谐波附近,电阻率随磁场归一化电流密度的振荡频率是回旋共振及其谐波的两倍,这与Hatke { \it et al.} [Phys. Rev. Lett. { \bf 101},246811(2008)]。电流引起的共振双光子和单光子过程的交替出现是这种频率倍增的原因。在回旋共振的第三次谐波附近,电流诱导的0-/3光子、双光子和单光子共振过程的连续出现可能导致电阻率振荡频率的三倍。

英文摘要:

Microwave-induced nonlinear magnetoresistance in a dc-driven two-dimensional electron system is examined using a multi-photon-assisted transport scheme direct controlled by the current. It is shown that near the 2nd subharmonic of the cyclotron resonance, the frequency of the resistivity oscillation with the magnetic-field-normalized current-density is double that at the cyclotron resonance and its harmonics, in excellent agreement with recent experimental findings by Hatke {\it et al.} [Phys. Rev. Lett. {\bf 101}, 246811 (2008)]. The current-induced alternative emergence of resonant two-photon and single-photon processes is responsible for this frequency doubling. Near the third subharmonic of the cyclotron resonance, the current-induced consecutive appearance of resonant 0-/3-photon, two-photon, and single-photon processes may lead to the frequency tripling of the resistivity oscillation.

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