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arXiv 1407.4655cond-mat.mes-hall
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轨道磁棘轮效应

Orbital magnetic ratchet effect

G. V. Budkin, L. E. Golub

摘要:

理论上考虑了磁棘轮--具有叠加非中心对称铁磁光栅的二维系统。结果表明,由于周期性磁场的纯轨道效应,辐射激发导致二维载流子定向运动。研究了基于拓扑绝缘体、石墨烯和半导体异质结构等二维体系的磁棘轮。详细研究了在空间振荡洛伦兹力作用下,载流子辐射加热和辐射电场加速产生电流的机理。计算了对线极化面取向和辐射螺旋度敏感的电流。它表明,磁棘轮电流的频率依赖性是由占主导地位的弹性散射机制的二维载体和不同的线性和抛物线的能量色散的系统。

英文摘要:

Magnetic ratchets -- two-dimensional systems with superimposed non-centrosymmetric ferromagnetic gratings -- are considered theoretically. It is demonstrated that excitation by radiation results in a directed motion of two-dimensional carriers due to pure orbital effect of the periodic magnetic field. Magnetic ratchets based on various two-dimensional systems like topological insulators, graphene and semiconductor heterostructures are investigated. The mechanisms of the electric current generation caused by both radiation-induced heating of carriers and by acceleration in the radiation electric field in the presence of space-oscillating Lorentz force are studied in detail. The electric currents sensitive to the linear polarization plane orientation as well as to the radiation helicity are calculated. It is demonstrated that the frequency dependence of the magnetic ratchet currents is determined by the dominant elastic scattering mechanism of two-dimensional carriers and differs for the systems with linear and parabolic energy dispersions.

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