Rashba field in GaN

Abstract

We discuss problem of Rashba field in bulk GaN and in GaN/AlGaN two-dimensional electron gas, basing on results of X-band microwave resonance experiments. We point at large difference in spin-orbit coupling between bulk material and heterostructures. We observe coupled plasmon-cyclotron resonance from the two-dimensional electron gas, but no spin resonance, being consistent with large zero-field spin splitting due to the Rashba field reported in literature. In contrast, small anisotropy of g-factor of GaN effective mass donors indicates rather weak Rashba spin-orbit coupling in bulk material, not exceed 400 Gauss, alpha_BIA < 4*10^-13 eVcm. Furthermore, we observe new kind of electron spin resonance in GaN, which we attribute to surface electron accumulation layer. We conclude that the sizable Rashba field in GaN/AlGaN heterostructures originates from properties of the interface.

References in corpus (7)

• Large Bychkov-Rashba spin-orbit coupling in high-mobility GaN/AlGaN heterostructures
• Demonstration of Rashba spin splitting in GaN-based heterostructures
• Suppression of the D'yakonov-Perel' spin relaxation mechanism for all spin components in [111] zincblende quantum wells
• Weak antilocalization and zero-field electron spin splitting in AlGaN/AlN/GaN heterostructures with a polarization induced two-dimensional electron gas
• Electron spin resonance on a 2-dimensional electron gas in a single AlAs quantum well
• Polarization-induced Rashba spin-orbit coupling in structurally symmetric III-Nitride quantum wells
• Resonant circular photogalvanic effect in GaN/AlGaN heterojunctions

Cited by in corpus (5)

• Spin-orbit coupling in wurtzite quantum wells
• Experimental determination of Rashba spin-orbit coupling in wurtzite $n$-GaN:Si
• Analytical solution of narrow quantum rings with general Rashba and Dresselhaus spin-orbit couplings
• Spin-relaxation time in the impurity band of wurtzite semiconductors
• Non-adiabatic Berry phase for semiconductor heavy holes under the coexistence of Rashba and Dresselhaus spin-orbit interactions