Rashba spin splitting and exchange enhancement of the g factor in InAs/AlSb heterostructures with a two-dimensional electron gas

摘要

The exchange enhancement of the g factor of quasiparticles in InAs/AlSb heterostructures with a two-dimensional electron gas exhibiting Rashba spin splitting is investigated using the 8-band k · p Hamiltonian. It is shown that, in low magnetic fields, Rashba spin splitting yields a profound increase in the amplitude of oscillations of the quasiparticle g factor renormalized by exchange interaction. From analysis of Shubnikov-de Haas oscillations at the temperature 250 mK, the energy of Rashba splitting and the g factor of quasiparticles are determined. The values determined experimentally are in good agreement with the results of theoretical calculations carried out with consideration for the asymmetric built-in electric field in InAs/AlSb heterostructures.