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

• Published in: arXiv.org
• Main Authors: Kou, Xufeng, Shih-Ting, Guo, Fan, Yabin, Pan, Lei, Lang, Murong, Jiang, Ying, Shao, Qiming, Nie, Tianxiao, Murata, Koichi, Tang, Jianshi, Wang, Yong, He, Liang, Ting-Kuo, Lee, Wei-Li, Lee, Wang, Kang L
• Format: Paper Journal Article
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 06.08.2014
• Subjects: Film thickness; Invariants; Magnetism; Physics - Materials Science; Physics - Mesoscale and Nanoscale Physics; Quantum Hall effect; Quantum transport; Resistance; Thin films; Topological insulators; Transport phenomena
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.1406.0106

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.