arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.05626cond-mat.mes-hallcond-mat.mtrl-sci
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WTe2中的自旋倾斜织构和量子自旋霍尔效应

Canted Spin Texture and Quantum Spin Hall Effect in WTe2

Jose H. Garcia, Marc Vila, Chuang-Han Hsu, Xavier Waintal, Vitor M. Pereira, Stephan Roche

摘要:

我们报道了单层T $_\text{d}$ -WTe $_2$中的非常规量子自旋霍尔相,它在其他拓扑材料中表现出迄今未知的特征。结构的低对称性在$yz$平面上诱导了倾斜的自旋织构,这决定了拓扑保护边界态的自旋极化。此外,自旋霍尔电导率被量子化($2e^2/h$),其中自旋量子化轴平行于倾斜方向。这些研究结果是基于大规模的自旋霍尔电导率张量和非局部电阻的多探针几何形状,使用一个现实的紧束缚模型,从第一性原理方法阐述的量子模拟。这种倾斜的量子自旋霍尔效应的观察,与非平凡的自旋极化的拓扑边缘状态的形成有关,需要特定的实验设计,并提出了有趣的替代方案来操纵拓扑材料中的自旋信息。

英文摘要:

We report an unconventional quantum spin Hall phase in the monolayer T$_\text{d}$-WTe$_2$, which exhibits hitherto unknown features in other topological materials. The low-symmetry of the structure induces a canted spin texture in the $yz$ plane, which dictates the spin polarization of topologically protected boundary states. Additionally, the spin Hall conductivity gets quantized ($2e^2/h$) with a spin quantization axis parallel to the canting direction. These findings are based on large-scale quantum simulations of the spin Hall conductivity tensor and nonlocal resistances in multi-probe geometries using a realistic tight-binding model elaborated from first-principle methods. The observation of this canted quantum spin Hall effect, related to the formation of topological edge states with nontrivial spin polarization, demands for specific experimental design and suggests interesting alternatives for manipulating spin information in topological materials.

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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