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arXiv 1805.06337cond-mat.mtrl-sci
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HfNiSn单晶表面态的手征输运和电子关联

Chiral transport and electronic correlations in surface states of HfNiSn single crystals

L. Steinke, J. J. Kistner-Morris, T. F. Lovorn, H. He, A. D. Hillier, P. Miao, S. Zellman, M. Klemm, M. Green, O. Gonzalez, A. H. MacDonald, M. C. Aronson

摘要:

在大多数拓扑绝缘体中,与具有孤立原子的等效绝缘体相比,价带和导带以相反或颠倒的顺序出现。在这里,我们探索一个不同的路线走向拓扑非平凡的状态,可能会出现从金属状态存在于表面上的大块绝缘体没有这样的带反转。高质量的HfNiSn单晶显示出弱反局域化的表面输运,与强自旋轨道耦合存在下的二维金属态一致。非线性I(V)曲线表明,电子相关的手征,非本地传输组件,定性类似于量子霍尔边缘状态,但在没有外部磁场。相关性本身可能发挥决定性的作用,在创建一个明显的拓扑非平凡状态的HfNiSn表面。

英文摘要:

In most topological insulators, the valence and conduction band appear in reverse or inverted order compared to an equivalent insulator with isolated atoms. Here, we explore a different route towards topologically nontrivial states that may arise from metallic states present on the surface of bulk insulators without such band inversion. High-quality single crystals of HfNiSn show surface transport with weak anti-localization, consistent with a two-dimensional metallic state in the presence of strong spin-orbit coupling. Nonlinear I(V) curves indicate electronic correlations related to a chiral, nonlocal transport component that is qualitatively similar to a quantum Hall edge state, yet in the absence of external magnetic fields. The correlations themselves may play a decisive role in creating an apparent topologically nontrivial state on the HfNiSn surface.

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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