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arXiv 1102.1002cond-mat.mes-hall
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面内磁场对量子点自旋轨道相互作用的调谐

Tuning of the spin-orbit interaction in a quantum dot by an in-plane magnetic field

M. P. Nowak, B. Szafran, F. M. Peeters, B. Partoens, W. Pasek

摘要:

使用精确对角化的方法,我们表明,一个和两个电子的InAs量子点表现出避免交叉的能谱中所引起的自旋-轨道耦合在面内外部磁场的存在下。避免交叉的宽度强烈地依赖于磁场的取向,这揭示了自旋轨道耦合相互作用的固有各向异性。我们发现,对于特定方向的磁场避免交叉消失。这个方向的值可以用来提取Rashba和Dresselhaus相互作用强度的比值。自旋轨道各向异性效应的各种几何形状和取向的限制势进行了讨论。我们的分析解释了最近在门控自组装量子点上进行的测量背后的物理学[S. Takahashi等人,Phys. Rev. Lett. 104,246801(2010)]。

英文摘要:

Using an exact diagonalization approach we show that one- and two-electron InAs quantum dots exhibit avoided crossing in the energy spectra that are induced by the spin-orbit coupling in the presence of an in-plane external magnetic field. The width of the avoided crossings depends strongly on the orientation of the magnetic field which reveals the intrinsic anisotropy of the spin-orbit coupling interactions. We find that for specific orientations of the magnetic field avoided crossings vanish. Value of this orientation can be used to extract the ratio of the strength of Rashba and Dresselhaus interactions. The spin-orbit anisotropy effects for various geometries and orientations of the confinement potential are discussed. Our analysis explains the physics behind the recent measurements performed on a gated self-assembled quantum dot [S. Takahashi et al. Phys. Rev. Lett. 104, 246801 (2010)].

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