Pure spin photocurrent in non-centrosymmetric crystals: bulk spin photovoltaic effect.

Pure spin photocurrent in non-centrosymmetric crystals: bulk spin photovoltaic effect.
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DOI:
10.1038/s41467-021-24541-7
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发表时间:
2021-07-15
影响因子:
16.6
通讯作者:
Li J
Li J
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Xu H;Wang H;Zhou J;Li J

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Spin current generators are critical components for spintronics-based information processing. In this work, we theoretically and computationally investigate the bulk spin photovoltaic (BSPV) effect for creating DC spin current under light illumination. The only requirement for BSPV is inversion symmetry breaking, thus it applies to a broad range of materials and can be readily integrated with existing semiconductor technologies. The BSPV effect is a cousin of the bulk photovoltaic (BPV) effect, whereby a DC charge current is generated under light. Thanks to the different selection rules on spin and charge currents, a pure spin current can be realized if the system possesses mirror symmetry or inversion-mirror symmetry. The mechanism of BSPV and the role of the electronic relaxation time are also elucidated. We apply our theory to several distinct materials, including monolayer transition metal dichalcogenides, anti-ferromagnetic bilayer MnBi2Te4, and the surface of topological crystalline insulator cubic SnTe. Light offers a fast and non-invasive way to generate spin-currents in materials, however, this typically requires special ingredients such as magnetic materials, or circularly polarised light. In this theory work, the authors show how the nonlinear optical effect can generate a spin current, with the only requirement being broken inversion symmetry.
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