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

TL;DR

This paper investigates how intense terahertz laser fields influence the spin-dependent properties of a Rashba spin-orbit coupled two-dimensional electron gas, revealing induced magnetic moments and potential signal conversion applications.

Contribution

It introduces a Floquet-based method to analyze the effects of intense terahertz fields on spin polarization and magnetic moments in a Rashba 2DEG, highlighting novel spin responses.

Findings

Strong modification of spin-dependent density of states by terahertz fields

Induction of a perpendicular terahertz magnetic moment

Potential for converting terahertz electric signals into magnetic signals

Abstract

The spin-dependent density of states and the density of spin polarization of an InAs-based two-dimensional electron gas with the Rashba spin-orbit coupling under an intense terahertz laser field are investigated by utilizing the Floquet states to solve the time-dependent Schr\"odinger equation. It is found that both densities are strongly affected by the terahertz laser field. Especially a terahertz magnetic moment perpendicular to the external terahertz laser field in the electron gas is induced. This effect can be used to convert terahertz electric signals into terahertz magnetic ones efficiently.