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arXiv 1406.0106cond-mat.mes-hallcond-mat.mtrl-sci
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二维极限外磁拓扑绝缘体中的标度不变无耗散手征输运

Scale-Invariant Dissipationless Chiral Transport in Magnetic Topological Insulators beyond the Two-Dimensional Limit

Xufeng Kou, Shih-Ting Guo, Yabin Fan, Lei Pan, Murong Lang, Ying Jiang, Qiming Shao, Tianxiao Nie, Koichi Murata, Jianshi Tang, Yong Wang, Liang He, Ting-Kuo Le… 展开作者

Xufeng Kou, Shih-Ting Guo, Yabin Fan, Lei Pan, Murong Lang, Ying Jiang, Qiming Shao, Tianxiao Nie, Koichi Murata, Jianshi Tang, Yong Wang, Liang He, Ting-Kuo Lee, Wei-Li Lee, Kang L. Wang

摘要:

我们研究了毫米级(Cr0.12Bi0.26Sb0.62)2 Te 3薄膜中的量子反常霍尔效应(QAHE)和相关的手征输运。具有高的样品质量和强大的磁性在低温下,量子化霍尔电导的e2/h被发现持续,即使当膜厚度是超过二维(2D)杂交限制。同时,非局域输运测量结果表明了Chern绝缘体特征的手征边缘导电。在对比的2D杂化薄膜,一个额外的弱场依赖性的纵向电阻中观察到的10五层膜,表明在QAHE制度的耗散边缘通道上的膜厚度的影响。将QAHE扩展到三维厚度区域解决了这种量子输运现象的普遍性,并激发了对具有可调陈数的新QAHE相的探索。此外,在宏观尺度上观察尺度不变的无耗散手性传播,使理想的低功耗互连应用迈出了一大步。

英文摘要:

We investigate the quantum anomalous Hall Effect (QAHE) and related chiral transport in the millimeter-size (Cr0.12Bi0.26Sb0.62)2Te3 films. With high sample quality and robust magnetism at low temperatures, the quantized Hall conductance of e2/h is found to persist even when the film thickness is beyond the two-dimensional (2D) hybridization limit. Meanwhile, the Chern insulator-featured chiral edge conduction is manifested by the non-local transport measurements. In contrast to the 2D hybridized thin film, an additional weakly field-dependent longitudinal resistance is observed in the 10 quintuple-layer film, suggesting the influence of the film thickness on the dissipative edge channel in the QAHE regime. The extension of QAHE into the three-dimensional thickness region addresses the universality of this quantum transport phenomenon and motivates the exploration of new QAHE phases with tunable Chern numbers. In addition, the observation of the scale-invariant dissipationless chiral propagation on a macroscopic scale makes a major stride towards ideal low-power interconnect applications.

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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