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arXiv 1505.04535cond-mat.mes-hall
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窄HgTe量子阱中边缘电流宏观长度尺度自旋相干性的证据

Evidence on the macroscopic length scale spin coherence for the edge currents in a narrow HgTe quantum well

A. Kononov, S. V. Egorov, Z. D. Kvon, N. N. Mikhailov, S. A. Dvoretsky, E. V. Deviatov

摘要:

我们实验研究自旋极化电子输运之间的两个铁磁接触,放置在边缘的二维电子系统的带反转。该系统在窄(8~nm)HgTe量子阱中实现,铁磁侧接触由预磁化的坡莫合金薄膜形成。在零磁场中,我们发现一个显着的边缘电流的两个铁磁接触之间的传输的贡献。实验证明,这种输运对两个200~ $μ$ m间距的铁磁引线的磁化方向的相互取向是敏感的。这是宏观距离上自旋相干边输运的直接实验证据。因此,自旋是非常强大的边缘的二维电子系统与带反转,确认螺旋自旋分辨性质的边缘电流。

英文摘要:

We experimentally investigate spin-polarized electron transport between two ferromagnetic contacts, placed at the edge of a two-dimensional electron system with band inversion. The system is realized in a narrow (8~nm) HgTe quantum well, the ferromagnetic side contacts are formed from a pre-magnetized permalloy film. In zero magnetic field, we find a significant edge current contribution to the transport between two ferromagnetic contacts. We experimentally demonstrate that this transport is sensitive to the mutual orientation of the magnetization directions of two 200~$μ$m-spaced ferromagnetic leads. This is a direct experimental evidence on the spin-coherent edge transport over the macroscopic distances. Thus, the spin is extremely robust at the edge of a two-dimensional electron system with band inversion, confirming the helical spin-resolved nature of edge currents.

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