Resonant Spin and Charge Hall Effects in 2D Electron Gas with Unequal Rashba and Dresselhaus Spin-Orbit Couplings under a Perpendicular Magnetic Field

TL;DR

This paper explores how unequal Rashba and Dresselhaus spin-orbit couplings in a 2D electron gas under a magnetic field lead to resonant spin and charge Hall effects, with potential applications in spintronics.

Contribution

It demonstrates the simultaneous resonance of spin and charge Hall conductances in a system with unequal Rashba and Dresselhaus couplings, revealing universal effects in such semiconductors.

Findings

Resonant charge and spin Hall conductances occur at specific magnetic fields.

System exhibits nearly degenerate Landau levels at resonance.

Resonant effects are universal in certain semiconductor materials.

Abstract

We have investigated the complex two-dimensional electron system with unequal Rashba and Dresselhaus spin-orbit interactions in the presence of a perpendicular magnetic field. The spin polarizations are obtained in a wide range of magnetic fields. It is shown that such a system is hard to be magnetized. We also find that the resonant charge and spin Hall conductances occurs simultaneously at a certain magnetic field, at which two (nearly) degenerate Landau levels are filled partly. The resonant Hall effects are universal in this type of semiconductor materials, and could have potential application for semiconductor spintronics.