Photoinduced spin-Hall resonance in a k3 -Rashba spin-orbit coupled two-dimensional hole system

Abstract

We study the band structure modulation and spin-Hall effect of an irradiated two-dimensional heavy-hole system with ${k}^{3}$-Rashba spin-orbit coupling. We find that the band structure becomes anisotropic under the illumination by the light. Most remarkably, in the presence of linearly polarized light a pair of additional spin-degeneracy points, apart from the $\mathrm{\ensuremath{\Gamma}}$ point, emerge in the energy dispersion. The locations of these points are solely determined by the amplitude of the incident light. If this degeneracy occurs around the Fermi level, the spin-Hall conductivity exhibits a resonance. Away from the degeneracy points, the light rotates the average spin polarization. The possible effects of ${k}^{3}$-Dresselhaus spin-orbit coupling are also discussed.