Shift photovoltaic current and magnetically induced bulk photocurrent in piezoelectric sillenite crystals
Shift photovoltaic current and magnetically induced bulk photocurrent in piezoelectric sillenite crystals
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DOI：
10.1103/physrevb.102.081113
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发表时间：
2020-08-18
影响因子：
3.7
通讯作者：
Fridkin, Vladimir M.
中科院分区：
文献类型：
--
作者：
Burger, Aaron M.;Gao, Lingyuan;Fridkin, Vladimir M.
最近，已经示出了如何在压电硅线石晶体Bi 12GeO20和Bi 12SiO20中的移位电流和弹道电流可以在假设循环电流的移位分量小的情况下通过实验分离。然而，有人声称，位移和弹道电流不能量化的这种方法，由于磁光伏效应所造成的晶体的空间对称性的变化，在磁场中，或由时间反演对称性的破坏。目前，我们报告的光伏电流在Bi 12SiO 20，激发线偏振光和圆偏振光在弱的外部磁场下，以及相应的光霍尔信号的测量观测。我们表明，磁光伏电流构成了一个显着的分数，在霍尔方向的测量电流为Bi 12SiO 20在特定的实验条件下。
Recently, it has been shown how shift and ballistic currents in piezoelectric sillenite crystals Bi12GeO20 and Bi12SiO20 can be separated experimentally under the assumption that the shift component of the circular current is small. However, it has been claimed that the shift and ballistic currents cannot be quantified by this method, due to the magnetophotovoltaic effect caused either by the change of the crystal's spatial symmetry in the magnetic field or by the breaking of time-reversal symmetry. Presently, we report observations of photovoltaic currents in Bi12SiO20, excited by linearly and circularly polarized light under weak external magnetic field, as well as measurements of the corresponding photo-Hall signals. We demonstrate that the magnetophotovoltaic current constitutes a significant fraction of the measured current in the Hall direction for Bi12SiO20 under specific experimental conditions.