Distinct Quantum Anomalous Hall Ground States Induced by Magnetic Disorders

The quantum anomalous Hall (QAH) effect in a magnetic topological insulator (TI) represents a new state of matter originating from the interplay between topology and magnetism. The defining characteristics of the QAH ground state are the quantized Hall resistivity (ρ_{yx}) and vanishing longitudinal...

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Autores principales:	Chang Liu, Yunbo Ou, Yang Feng, Gaoyuan Jiang, Weixiong Wu, Shaorui Li, Zijia Cheng, Ke He, Xucun Ma, Qikun Xue, Yayu Wang
Formato:	article
Lenguaje:	EN
Publicado:	American Physical Society 2020
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/ad7675a417334d608dc8f8a6b6f71b92
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spelling	oai:doaj.org-article:ad7675a417334d608dc8f8a6b6f71b922021-12-02T14:09:11ZDistinct Quantum Anomalous Hall Ground States Induced by Magnetic Disorders10.1103/PhysRevX.10.0410632160-3308https://doaj.org/article/ad7675a417334d608dc8f8a6b6f71b922020-12-01T00:00:00Zhttp://doi.org/10.1103/PhysRevX.10.041063http://doi.org/10.1103/PhysRevX.10.041063https://doaj.org/toc/2160-3308The quantum anomalous Hall (QAH) effect in a magnetic topological insulator (TI) represents a new state of matter originating from the interplay between topology and magnetism. The defining characteristics of the QAH ground state are the quantized Hall resistivity (ρ_{yx}) and vanishing longitudinal resistivity (ρ_{xx}) in the absence of an external magnetic field. A fundamental question concerning the QAH effect is whether it is merely a zero-magnetic-field quantum Hall (QH) effect or if it can host unique quantum phases and phase transitions that are unavailable elsewhere. The most dramatic departure of the QAH systems from other QH systems lies in the magnetic disorders that induce spatially random magnetization. Because disorder and magnetism play pivotal roles in the phase diagram of two-dimensional electron systems, the high degree of magnetic disorders in QAH systems may create novel phases and quantum critical phenomena. In this work, we perform systematic transport studies of a series of magnetic TIs with varied strength of magnetic disorders. We find that the ground state can be categorized into two distinct classes: the QAH phase and the anomalous Hall (AH) insulator phase, as the zero-magnetic-field counterparts of the QH liquid and Hall insulator phases in the QH systems. In the low-disorder limit of the QAH phase, we observe a universal quantized longitudinal resistance ρ_{xx}=h/e^{2} at the coercive field. In the AH insulator regime, we find that a magnetic field can drive it to the QAH phase through a quantum critical point with scaling behaviors that are distinct from those in the QH phase transition. We propose that the transmission between chiral edge states at domain boundaries, tunable by magnetic disorder and magnetic fields, is the key for determining the QAH ground state.Chang LiuYunbo OuYang FengGaoyuan JiangWeixiong WuShaorui LiZijia ChengKe HeXucun MaQikun XueYayu WangAmerican Physical SocietyarticlePhysicsQC1-999ENPhysical Review X, Vol 10, Iss 4, p 041063 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 Chang Liu Yunbo Ou Yang Feng Gaoyuan Jiang Weixiong Wu Shaorui Li Zijia Cheng Ke He Xucun Ma Qikun Xue Yayu Wang Distinct Quantum Anomalous Hall Ground States Induced by Magnetic Disorders
description	The quantum anomalous Hall (QAH) effect in a magnetic topological insulator (TI) represents a new state of matter originating from the interplay between topology and magnetism. The defining characteristics of the QAH ground state are the quantized Hall resistivity (ρ_{yx}) and vanishing longitudinal resistivity (ρ_{xx}) in the absence of an external magnetic field. A fundamental question concerning the QAH effect is whether it is merely a zero-magnetic-field quantum Hall (QH) effect or if it can host unique quantum phases and phase transitions that are unavailable elsewhere. The most dramatic departure of the QAH systems from other QH systems lies in the magnetic disorders that induce spatially random magnetization. Because disorder and magnetism play pivotal roles in the phase diagram of two-dimensional electron systems, the high degree of magnetic disorders in QAH systems may create novel phases and quantum critical phenomena. In this work, we perform systematic transport studies of a series of magnetic TIs with varied strength of magnetic disorders. We find that the ground state can be categorized into two distinct classes: the QAH phase and the anomalous Hall (AH) insulator phase, as the zero-magnetic-field counterparts of the QH liquid and Hall insulator phases in the QH systems. In the low-disorder limit of the QAH phase, we observe a universal quantized longitudinal resistance ρ_{xx}=h/e^{2} at the coercive field. In the AH insulator regime, we find that a magnetic field can drive it to the QAH phase through a quantum critical point with scaling behaviors that are distinct from those in the QH phase transition. We propose that the transmission between chiral edge states at domain boundaries, tunable by magnetic disorder and magnetic fields, is the key for determining the QAH ground state.
format	article
author	Chang Liu Yunbo Ou Yang Feng Gaoyuan Jiang Weixiong Wu Shaorui Li Zijia Cheng Ke He Xucun Ma Qikun Xue Yayu Wang
author_facet	Chang Liu Yunbo Ou Yang Feng Gaoyuan Jiang Weixiong Wu Shaorui Li Zijia Cheng Ke He Xucun Ma Qikun Xue Yayu Wang
author_sort	Chang Liu
title	Distinct Quantum Anomalous Hall Ground States Induced by Magnetic Disorders
title_short	Distinct Quantum Anomalous Hall Ground States Induced by Magnetic Disorders
title_full	Distinct Quantum Anomalous Hall Ground States Induced by Magnetic Disorders
title_fullStr	Distinct Quantum Anomalous Hall Ground States Induced by Magnetic Disorders
title_full_unstemmed	Distinct Quantum Anomalous Hall Ground States Induced by Magnetic Disorders
title_sort	distinct quantum anomalous hall ground states induced by magnetic disorders
publisher	American Physical Society
publishDate	2020
url	https://doaj.org/article/ad7675a417334d608dc8f8a6b6f71b92
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Distinct Quantum Anomalous Hall Ground States Induced by Magnetic Disorders

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