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arXiv 2209.03053cond-mat.mes-hall
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宇称不变费米面上的半整数量子化霍尔效应

Half-Quantized Hall Effect at the Parity-Invariant Fermi Surface

Jin-Yu Zou, Rui Chen, Bo Fu, Huan-Wen Wang, Zi-Ang Hu, Shun-Qing Shen

AI总结:

本文在磁性掺杂拓扑绝缘体异质结中发现单个无能隙狄拉克锥,其霍尔电导以 e²/h 为单位呈半整数量子化,并解释了近期实验中二分之一霍尔电导的起源,展示了二分之一拓扑不变量的凝聚态实现。

摘要:

在二维凝聚态体系中实现单个费米子狄拉克锥是一个长期存在的难题。本文报道了在磁性掺杂拓扑绝缘体异质结中发现具有半整数量子化霍尔电导的单个无能隙狄拉克锥。研究表明,当费米面附近宇称对称性保持不变时,霍尔电导以 e^{2}/h 为单位呈现半整数量子化。该无能隙狄拉克点稳定存在,并受到局域宇称对称性以及拓扑绝缘体拓扑非平庸能带结构的保护。最近实验 [Mogi et al, Nat. Phys. 18, 390 (2022)] 中观测到的二分之一霍尔电导被归因于该无能隙狄拉克锥的存在。这些结果表明了一种具有二分之一拓扑不变量的拓扑相的凝聚态实现。

英文摘要:

Condensed matter realization of a single Dirac cone of fermions in two dimensions is a long-standing issue. Here we report the discovery of a single gapless Dirac cone of half-quantized Hall conductance in a magnetically-doped topological insulator heterostructure. It demonstrates that the Hall conductance is half-quantized in the unit e^{2}/h when the parity symmetry is invariant near the Fermi surface. The gapless Dirac point is stable and protected by the local parity symmetry and the topologically nontrivial band structure of the topological insulator. The one-half Hall conductance observed in a recent experiment [Mogi et al, Nat. Phys. 18, 390 (2022)] is attributed to the existence of the gapless Dirac cone. The results suggest a condensed matter realization of a topological phase with a one-half topological invariant.

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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