Ultrafast magneto-photocurrents in GaAs: Separation of surface and bulk contributions
Ultrafast magneto-photocurrents in GaAs: Separation of surface and bulk contributions
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DOI：
10.1063/1.4917568
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发表时间：
2015-04-06
影响因子：
4
通讯作者：
Bieler, Mark
中科院分区：
文献类型：
--
作者：
Schmidt, Christian B.;Priyadarshi, Shekhar;Bieler, Mark
我们诱导超快磁光电流在GaAs晶体采用带间激发飞秒激光脉冲在室温下和非侵入性分离的表面和整体电流响应的贡献。不同的对称性贡献之间的分离是通过测量同时发射的太赫兹辐射不同的样品取向。线性和圆偏振激发的磁光电流的激发强度和光子能量依赖性揭示了不同的微观起源，其中之一是逆自旋霍尔效应的参与。我们的实验对于更好地理解磁场中复杂的动量-空间载流子动力学具有重要意义。(C)2015 AIP Publishing LLC.
We induce ultrafast magneto-photocurrents in a GaAs crystal employing interband excitation with femtosecond laser pulses at room temperature and non-invasively separate surface and bulk contributions to the overall current response. The separation between the different symmetry contributions is achieved by measuring the simultaneously emitted terahertz radiation for different sample orientations. Excitation intensity and photon energy dependences of the magneto-photocurrents for linearly and circularly polarized excitations reveal an involvement of different microscopic origins, one of which is the inverse spin Hall effect. Our experiments are important for a better understanding of the complex momentum-space carrier dynamics in magnetic fields. (C) 2015 AIP Publishing LLC.