非对称In_(0.53)Ga_(0.47)As/In_(0.52)Al_(0.48)As量子阱的零场自旋分裂能与高场g因子（英文）

Zero-field spin splitting and high-field g- factor of an asymmetrical In_(0.53)Ga_(0.47)As/In_(0.52)Al_(0.48)As quantum well

研究了非对称In_(0.53)Ga_(0.47)As/In_(0.52)Al_(0.48)As量子阱中二维电子气的磁输运性质,所测量的样品的径向磁阻R_(xx)的Shubinikov-de Haas振荡没有呈现出拍频的特征。通过测量样品的反弱局域效应提取了其零场自旋分裂能并通过对自旋分裂的R_(xx)双峰间距随倾斜角度θ的依赖关系的拟合提取了高场下的有效g因子。样品的Dingle plot图呈现非线性的特征。

This paper investigated the magnetotransport properties of the two-dimensional electron system in an asymmetrical In_（0.53）Ga_（0.47）As/In_（0.52）Al_（0.48）As quantum well,in which the expected beatings in the Shubinikov-de Haas oscillations of the longitudinal magnetoresistance Rxx were not observed. Zero-field spin splitting was extracted by measuring the weak anti-localization effect and the high field effective g-factor,g＊,was extracted by fitting the tilt angle θ-dependent spacing of spin-splitted R_（xx） peaks. The Dingle plot is shown to be nonlinear,which can be attributed to the long-range scattering potential from the doping Be atoms near the substrate.