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arXiv 0808.1983cond-mat.mes-hall
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横向周期势异质结中太赫兹辐射的棘轮效应

Ratchet effects induced by terahertz radiation in heterostructures with a lateral periodic potential

P. Olbrich, E. L. Ivchenko, T. Feil, R. Ravash, S. D. Danilov, J. Allerdings, D. Weiss, S. D. Ganichev

摘要:

报道了在一维横向周期势作用下,太赫兹辐射在半导体异质结中诱导的光电流的观测结果。电势是通过在样品表面蚀刻光栅来产生的。电流响应是很好地描述了唯象理论,包括圆形和线性光电流效应。实验数据表明,通过电子束光刻可以改变周期性横向图案的反转不对称性,以产生经典的横向棘轮。一种新的微观机制的偏振相关的光电流效应已被提出来解释的实验结果。光电流的产生是基于横向周期势和调制面内泵浦的共同作用。后一种调制源于通过光栅传播的辐射的近场效应。

英文摘要:

We report on the observation of terahertz radiation induced photogalvanic currents in semiconductor heterostructures with one-dimensional lateral periodic potential. The potential is produced by etching a grating into the sample surface. The electric current response is well described by phenomenological theory including both the circular and linear photogalvanic effects. Experimental data demonstrate that the inversion asymmetry of the periodic lateral pattern can be varied by means of electron beam lithography to produce classical lateral ratchets. A novel microscopical mechanism for the polarization-dependent photogalvanic effects has been proposed to interpret the experimental findings. The photocurrent generation is based on the combined action of the lateral periodic potential and the modulated in-plane pumping. The latter modulation stems from near-field effects of the radiation propagating through the grating.

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