Abstract
The nonlinear charge mobility and current-induced spin polarization in the nonlinear surface transport of a topological insulator with a hexagonal deforming band are investigated in the presence of a strong dc electric field by means of a balance-equation approach for a single energy band. The nonlinear mobility exhibits a broad peak with respect to increasing electric field in warping systems. The in-plane perpendicular spin polarization is also sensitive to the electric field, warping constant, surface density, and temperature. An out-of-plane spin polarization, the magnitude of which is strongly carrier-density dependent, emerges in systems with warping bands at high electric fields, and drops quickly with increasing temperature.
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