# Nonlinear Inverse Spin Galvanic Effect in Anisotropic Disorder-free Systems

## TL;DR

This paper theoretically explores the nonlinear inverse spin galvanic effect in anisotropic, disorder-free ultracold atomic systems with spin-orbit coupling, revealing unique spin polarization behaviors beyond traditional electron gases.

## Contribution

It generalizes the inverse spin galvanic effect to anisotropic ultracold atoms, highlighting differences from electron gases and advancing spin control understanding.

## Key findings

- Longer spin states in small momentum regimes with dominant SOC
- Asymmetric spin polarization due to combined Rashba-Dresselhaus SOC
- Potential for improved spin state control in ultracold atomic systems

## Abstract

Spin transport phenomena in solid materials suffer limitations from spin relaxation associated to disorder or lack of translational invariance. Ultracold atoms, free of that disorder, can provide a platform to observe phenomena beyond the usual two-dimensional electron gas. By generalizing the approach used for isotropic two-dimensional electron gases, we theoretically investigate the inverse spin galvanic effect in the two-level atomic system in the presence of anisotropic Rashba-Dresselhaus spin-orbit couplings (SOC) and external magnetic field. We show that the combination of the SOC results in an asymmetric case: the total spin polarization considered for a small momentum has a longer spin state than in a two-dimensional electron gas when the SOC field prevails over the external electric field. Our results can be relevant for advancing experimental and theoretical investigations in spin dynamics as a basic approach for studying spin state control.