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Electron spin resonance and Rashba field in GaN-based materials

机译:GaN基材料中的电子自旋共振和Rashba场

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We discuss problem of Rashba field in bulk GaN and in GaN/Al _xGa_(1-x)N two-dimensional electron gas, basing on results of X-band microwave resonance experiments. We point at large difference in spinorbit coupling between bulk material and heterostructures. We observe coupled plasmoncyclotron 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 the literature. In contrast, small anisotropy of g-factor of GaN effective mass donors indicates rather weak Rashba spinorbit coupling in bulk material, not exceed 400 G, α_(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/Al_xGa_(1-x)N heterostructures originates from properties of the interface.
机译:基于X波段微波共振实验的结果,讨论了块状GaN和GaN / Al _xGa_(1-x)N二维电子气中的Rashba场问题。我们指出散装材料和异质结构之间的自旋轨道耦合存在很大差异。我们从二维电子气中观察到耦合等离激元回旋共振,但没有自旋共振,这与文献中报道的Rashba场导致的大零场自旋分裂是一致的。相反,GaN有效质量给体的g因子较小的各向异性表明,块状材料中的Rashba自旋轨道耦合相当弱,不超过400 G,α_(BIA)<4×10〜(-13)eVcm。此外,我们观察到GaN中新型的电子自旋共振,这归因于表面电子累积层。我们得出结论,GaN / Al_xGa_(1-x)N异质结构中的相当大的Rashba场源自界面的属性。

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