Magnetization in two-dimensional electron gas in a perpendicular magnetic field: The roles of edge states and spin-orbit coupling
Magnetization in two-dimensional electron gas in a perpendicular magnetic field: The roles of edge states and spin-orbit coupling
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DOI：
10.1103/physrevb.79.235327
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发表时间：
2009-02
影响因子：
3.7
通讯作者：
Zhigang Wang;Wei Zhang;Ping Zhang
中科院分区：
文献类型：
--
作者：
Zhigang Wang;Wei Zhang;Ping Zhang
研究了边缘态和Rashba自旋轨道相互作用（SOI）对二维电子气磁化强度的de哈斯-货车阿尔芬（dHvA）振荡的影响.系统的边界部分地提升了朗道能级的简并度，由此产生的边缘态导致锯齿状磁化振荡的中心和幅度的变化。SOI将相邻LL的自旋向上和自旋向下状态混合成两个不等间隔的能量分支。SOI的加入改变了磁化中dHvA振荡的明确定义的模式。磁场越弱，由于边缘效应和/或自旋-轨道耦合，dHvA振荡的变化越大。一些理论结果与实验数据进行了比较。
We study the de Haas--van Alphen (dHvA) oscillations in the magnetization of a two-dimensional electron gas under the influence of the edge states and/or the Rashba spin-orbit interaction (SOI). The boundaries of the systems lift partially the degeneracies of Landau levels (LLs) and the resulting edge states lead to the changes in both the center and the amplitude of the sawtoothlike magnetization oscillation. The SOI mixes the spin-up and spin-down states of neighboring LLs into two unequally spaced energy branches. The inclusion of SOI changes the well-defined sawtooth pattern of the dHvA oscillations in the magnetization. The weaker the magnetic field is, the larger the change in the dHvA oscillations is due to the edge effect and/or the spin-orbit coupling. Some theoretical results are compared with the experimental data.