Effects of Rashba spin splitting and exchange interaction in electron spin resonance in narrow-gap quantum well heterostructures

Abstract

We report an electron spin resonance (ESR) study in n-type narrow-gap quantum well (QW) heterostructures. By using the Hartree-Fock approximation based on the 8 k·p Hamiltonian the many-body theory of the ESR in narrow-gap QWs is developed. We have discovered significant enhancement of the ESR g-factor and its low-magnetic-field divergence in both in asymmetric and symmetric QWs which is caused by the exchange interaction in 2D electron gas (2DEG). The ESR energies estimated for 2DEG in asymmetrical InAs/AlSb QWs are compared with the experimental results obtained by electrically detected ESR technique. © Published under licence by IOP Publishing Ltd.