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arXiv 1109.4263cond-mat.mes-hall
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具有自旋轨道相互作用的二维电子系统中的界面态

Interface states in two-dimensional electron systems with spin-orbital interaction

Aleksei A. Sukhanov, Vladimir A. Sablikov

摘要:

采用带有效质量方法和包络函数的广义边界条件,研究了二维电子系统中不同自旋轨道相互作用(SOI)区域边界处的界面态.我们发现,即使有效界面势为零,界面态也会出乎意料地存在。取决于系统参数,这些状态的能量可以位于体态的禁带和导带中的任一个或两者中。界面态具有类似于二维拓扑绝缘体边缘态的手征自旋织构。然而,它们的能谱对界面势更敏感,最大的影响是由界面势的自旋相关分量产生的。我们还研究了SOI二维电子气带中界面态的尺寸量子化,发现量子化能量对带宽的非单调依赖性。

英文摘要:

Interface states at a boundary between regions with different spin-orbit interactions (SOIs) in two-dimensional (2D) electron systems are investigated within the one-band effective mass method with generalized boundary conditions for envelope functions. We have found that the interface states unexpectedly exist even if the effective interface potential equals zero. Depending on the system parameters, the energy of these states can lie in either or both forbidden and conduction bands of bulk states. The interface states have chiral spin texture similar to that of the edge states in 2D topological insulators. However, their energy spectrum is more sensitive to the interfacial potential, the largest effect being produced by the spin-dependent component of the interfacial potential. We have also studied the size quantization of the interface states in a strip of 2D electron gas with SOI and found an unusual (non-monotonic) dependence of the quantization energy on the strip width.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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