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Magnetophotocurrent in BiTeI with Rashba spin-split bands

机译:具有Rashba自旋分裂带的BiTeI中的磁光电流

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摘要

Magnetophotocurrent with possible spin polarization is generated at room temperature by breaking the time-reversal symmetry of bulk spin-split bands. The band gap excitation in a layered polar semiconductor BiTel with a large bulk Rashba spin splitting generates a directional photocurrent flowing along the direction orthogonal to both the in-plane magnetic field and crystal polar axis. The direction of this charge current can be flipped by reversing the magnetic field. The photocurrent is found to be independent of light polarization, and ascribed to the K-dependent relaxation of nonequilibrium carriers in the Zeeman-shifted spin-split bands.
机译:在室温下,通过打破整体自旋分裂带的时间反转对称性,可产生具有自旋极化的磁光电流。具有大块Rashba自旋分裂的层状极性半导体BiTel中的带隙激发会产生沿与面内磁场和晶体极轴正交的方向流动的定向光电流。充电电流的方向可以通过反转磁场来翻转。发现光电流与光偏振无关,并且归因于在塞曼位移的自旋分裂带中非平衡载流子的K依赖性弛豫。

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