Light-induced Nonlinear Spin Hall Current in Single-layer WTe
arXiv:2303.06238 · doi:10.1088/1367-2630/ad2822
Abstract
In this theoretical investigation, we analyze light-induced nonlinear spin Hall currents in a gated single-layer 1T-WTe, flowing transversely to the incident laser polarization direction. Our study encompasses the exploration of the second and third-order rectified spin Hall currents using an effective low-energy Hamiltonian and employing Kubo's formalism. We extend our analysis to a wide frequency range spanning both transparent and absorbing regimes, investigating the influence of light frequency below and above the optical band gap. Additionally, we investigate the influence of an out-of-plane gate potential on the system, disrupting inversion symmetry and effectively manipulating both the strength and sign of nonlinear spin Hall responses. We predict a pronounced third-order spin Hall current relative to its second-order counterpart. The predicted nonlinear spin currents show strong anisotropic dependence on the laser polarization angle. The outcomes of our study contribute to a generalized framework for nonlinear response theory within the spin channel will impact the development of the emerging field of opto-spintronic.
arXiv comment16 pages, 6 figures
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