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arXiv 0802.4250cond-mat.mes-hall
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空间反转对称性破缺的二维电子系统棘轮效应的实验研究

Experimental investigation of the ratchet effect in a two-dimensional electron system with broken spatial inversion symmetry

S. Sassine, Yu. Krupko, J. -C. Portal, Z. D. Kvon, R. Murali, K. P. Martin, G. Hill, A. D. Wieck

摘要:

我们报告的实验证据定向电子输运,诱导外部线性极化微波照射,在一个二维的空间周期性的非对称系统称为棘轮。在AlGaAs/GaAs异质结的高迁移率二维电子气中,通过人工半圆盘形反点阵列的图形化引入了空间对称性破缺。我们表明,运输的方向是有效地改变微波极化。研究了这种效应与磁场和温度的关系。这是朝着实现新的微波探测器和电流发生器迈出的重要一步。

英文摘要:

We report on experimental evidence of directed electron transport, induced by external linear-polarized microwave irradiation, in a two-dimensional spatially-periodic asymmetrical system called ratchet. The broken spatial symmetry was introduced in a high mobility two-dimensional electron gas based on AlGaAs/GaAs heterojunction, by patterning an array of artificial semi-discs-shaped antidots. We show that the direction of the transport is efficiently changed by microwave polarization. The dependence of the effect on magnetic field and temperature is investigated. This represents a significant step towards the realization of new microwave detectors and current generators.

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