Nonlinear spin current generation in noncentrosymmetric spin-orbit coupled systems
arXiv:1706.08647 · doi:10.1103/PhysRevB.95.224430
Abstract
Spin current plays a central role in spintronics. In particular, finding more efficient ways to generate spin current has been an important issue and studied actively. For example, representative methods of spin current generation include spin polarized current injections from ferromagnetic metals, spin Hall effect, and spin battery. Here we theoretically propose a new mechanism of spin current generation based on nonlinear phenomena. By using Boltzmann transport theory, we show that a simple application of the electric field induces spin current proportional to in noncentrosymmetric spin-orbit coupled systems. We demonstrate that the nonlinear spin current of the proposed mechanism is supported in the surface state of three-dimensional topological insulators and two-dimensional semiconductors with the Rashba and/or Dresselhaus interaction. In the latter case, the angular dependence of the nonlinear spin current can be manipulated by the direction of the electric field and by the ratio of the Rashba and Dresselhaus interactions. We find that the magnitude of the spin current largely exceeds those in the previous methods for a reasonable magnitude of the electric field. Furthermore, we show that application of AC electric fields (e.g. terahertz light) leads to the rectifying effect of the spin current where DC spin current is generated. These findings will pave a new route to manipulate the spin current in noncentrosymmetric crystals.
10 pages, 4 figures
References in corpus (11)
- Dissipationless Quantum Spin Current at Room Temperature
- Direct electronic measurement of the spin Hall effect
- Highly efficient and tuneable spin-to-charge conversion through Rashba coupling at oxide interfaces
- SU(2) Non-Abelian Holonomy and Dissipationless Spin Current in Semiconductors
- Theory of Spin Hall conductivity in n-doped GaAs
- Large Unidirectional Magnetoresistance in a Magnetic Topological Insulator
- Semiclassical theory of nonlinear magneto-optical responses with applications to topological Dirac/Weyl semimetals
- Strongly spin-orbit coupled two-dimensional electron gas emerging near the surface of polar semiconductors
- Nonlinear valley and spin currents from Fermi pocket anisotropy in 2D crystals
- Shift charge and spin photocurrents in Dirac surface states of topological insulator
- Spin Hall effect of conserved current: Conditions for a nonzero spin Hall current