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arXiv 1504.03422cond-mat.mes-hall
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量子化磁场作用下液态He表面电子气的表面光电流

Surface photocurrent in electron gas over liquid He subject to quantizing magnetic field

L. I. Magarill, M. V. Entin

摘要:

研究了量子化磁场存在下电子气在液态氦表面的光电流效应。气体受到向表面法线倾斜的弱交变微波电场的影响。线性和圆形的光电流效应进行了研究。电流通过间接光跃迁发生,并有ripplons发射或吸收的参与。光电流张量在微波频率$ω$处具有强共振,该频率接近尺寸量子化子带之间的跃迁频率。共振是对称的或反对称的,取决于张量分量。其他共振出现在$ω\approx n ω_c$,其中$n$是整数,$ω_c$是回旋频率。发现后者的共振分裂为两个峰,与发射或吸收的波纹子。计算得到的光电流系数与实验观测值符合较好。

英文摘要:

The photogalvanic effect is studied in electron gas over the liquid He surface with the presence of quantizing magnetic field. The gas is affected by the weak alternating microwave electric field tilted towards the surface normal. Both linear and circular photogalvanic effects are studied. The current occurs via indirect phototransition with the participation of ripplons emission or absorption. The photogalvanic tensor has strong resonances at the microwave frequency $ω$ approaching to the frequencies of transitions between size-quantized subbands. The resonances are symmetric or antisymmetric, depending on a tensor component. Other resonances appear at $ω\approx n ω_c$, where $n$ being integer and $ω_c$ is the cyclotron frequency. It is found that the latter resonances split to two peaks connected with emission or absorption of ripplons. The calculated photogalvanic coefficients are in accord with the experimental observed values.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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