Electron spin resonance on a 2-dimensional electron gas in a single AlAs quantum well

TL;DR

This study demonstrates direct electron spin resonance on a high mobility 2D electron gas in an AlAs quantum well, revealing precise g-factors and insights into spin-orbit interactions using a novel detection method.

Contribution

It provides the first direct ESR measurements on a 2D electron gas in AlAs quantum wells, highlighting the effects of spin-orbit interaction and microwave electric field modulation.

Findings

Measured g-factors of 1.991 and 1.989 at different frequencies

Identified ESR signal origin from spin-orbit interaction effects

Observed temperature dependence of ESR amplitude

Abstract

Direct electron spin resonance (ESR) on a high mobility two dimensional electron gas in a single AlAs quantum well reveals an electronic $g$-factor of 1.991 at 9.35 GHz and 1.989 at 34 GHz with a minimum linewidth of 7 Gauss. The ESR amplitude and its temperature dependence suggest that the signal originates from the effective magnetic field caused by the spin orbit-interaction and a modulation of the electron wavevector caused by the microwave electric field. This contrasts markedly to conventional ESR that detects through the microwave magnetic field.