Exploiting anisotropic Rashba effects on real-time photocurrents and spin polarization for transient symmetry breaking

• URL: http://arxiv.org/abs/2208.04805v1
• Date: Tue, 9 Aug 2022 14:32:07 GMT
• Title: Exploiting anisotropic Rashba effects on real-time photocurrents and spin polarization for transient symmetry breaking
• Authors: Matisse Wei-Yuan Tu, Jyh-Pin Chou and Chih-Wei Luo
• Abstract summary: We investigate the real-time transient responses of a two-dimensional (2D) electron gas with anisotropic Rashba spin-orbit coupling to laser pulses. We find that the transient breaking of the mirror symmetry in combination with the anisotropy of the Rashba SOC results in significant distinction between the charge-mediated and the spin-mediated contributions to the photocurrents.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We theoretically investigate the real-time transient responses of a two-dimensional (2D) electron gas with anisotropic Rashba spin-orbit coupling (SOC) to laser pulses. Through explicitly monitoring the time-dependent photocurrents and spin polarization under different linear polarizations of the laser pulse, we find that the transient breaking of the mirror symmetry in combination with the anisotropy of the Rashba SOC results in significant distinction between the charge-mediated and the spin-mediated contributions to the photocurrents. Such distinction is obtained by analyzing the dependence of the symmetry-breaking induced (transverse) components of the photocurrents on the linear polarization angle of the laser pulse. This suggests a possibility of inferring spin-mediated processes in photocurrents without the use of circularly polarized lights. Moreover, the interplay between transient symmetry breaking and the anisotropy of the Rashba SOC also leads to transiently nonzero spin polarization components that are otherwise zero in the steady-state limit and the linear response regime. Especially, the out-of-plane spin polarization component can be induced or turned off by controlling the relative orientation of the linear polarization with respect to the symmetry axis of the 2D electronic system, without involving material-intrinsic magnetization effects. Our findings demonstrate the efficacy of a particular coordination between the polarization of the ultrafast laser pulses and the spatial symmetry of the electronic materials in directing the real-time charge and the spin responses that are fundamental to the development of ultrafast spintronics in solid states.

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