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arXiv 1102.0319cond-mat.mes-hall
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辐射感生磁电阻振荡区的微波感生电子加热

Microwave-induced electron heating in the regime of radiation-induced magnetoresistance oscillations

A. N. Ramanayaka, R. G. Mani, W. Wegscheider

摘要:

本文研究了微波光激发对二维GaAs/AlGaAs电子系统Shubnikov-de Haas(SdH)振荡振幅的影响,其中回旋频率$ω_{c}$和微波角频率$ω$满足$2 ω\le ω_{c} \le 3.5 ω$ .的SdH线形分析表明,增加入射微波功率的SdH振荡的振幅有一个微弱的影响,相比温和的温度变化对暗标本SdH效应的影响。结果表明,在适度的微波光激发下,电子加热可以忽略不计,与理论预测吻合得很好。

英文摘要:

We examine the influence of microwave photoexcitation on the amplitude of Shubnikov-de Haas (SdH) oscillations in a two dimensional GaAs/AlGaAs electron system in a regime where the cyclotron frequency, $ω_{c}$, and the microwave angular frequency, $ω$, satisfy $2 ω\le ω_{c} \le 3.5 ω$. A SdH lineshape analysis indicates that increasing the incident microwave power has a weak effect on the amplitude of the SdH oscillations, in comparison to the influence of modest temperature changes on the dark-specimen SdH effect. The results indicate negligible electron heating under modest microwave photoexcitation, in good agreement with theoretical predictions.

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