Intense terahertz laser fields on a two-dimensional hole gas with Rashba spin-orbit coupling

Abstract

We investigate the influence on the density of states and the density of spin polarization for a two-dimensional hole gas with Rashba spin-orbit coupling under intense terahertz laser fields. Via Floquet theorem, we solve the time-dependent Schrödinger equation and calculate these densities. It is shown that a terahertz magnetic moment can be induced for low hole concentration. Different from the electron case, the induced magnetic moment is quite anisotropic due to the anisotropic spin-orbit coupling. Both the amplitude and the direction of the magnetic moment depend on the direction of the terahertz field. We further point out that for high hole concentration, the magnetic moment becomes very small due to the interference caused by the momentum dependence of the spin-orbit coupling. This effect also appears in two-dimensional electron systems.

4 pages, 3 figures

References in corpus (8)

• Excitonic Dynamical Franz-Keldysh Effect
• Dynamical Franz-Keldysh effect
• Linear optical absorption spectra of mesoscopic structures in intense THz fields: free particle properties
• Hole spin relaxation in semiconductor quantum dots
• Hole spin dephasing in $p$-type semiconductor quantum wells
• Intense terahertz laser fields on a quantum dot with Rashba spin-orbit coupling
• Intense terahertz laser fields on a two-dimensional electron gas with Rashba spin-orbit coupling
• Spin relaxation in an InAs quantum dot in the presence of terahertz driving fields

Cited by in corpus (4)

• Spin dynamics in semiconductors
• Optical response of graphene under intense terahertz fields
• Interplay between spin-orbit interactions and a time-dependent electromagnetic field in monolayer graphene
• Kinetics of spin coherence of electrons in $n$-type InAs quantum wells under intense terahertz laser fields