$Dirac Surface States in Intrinsic Magnetic Topological Insulators EuSn_{2}As_{2} and MnBi_{2n}Te_{3n+1}$
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Dirac Surface States in Intrinsic Magnetic Topological Insulators EuSn_{2}As_{2} and MnBi_{2n}Te_{3n+1}

In magnetic topological insulators (TIs), the interplay between magnetic order and nontrivial topology can induce fascinating topological quantum phenomena, such as the quantum anomalous Hall effect, chiral Majorana fermions, and axion electrodynamics. Recently, a great deal of attention has been fo...

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Autores principales:	Hang Li, Shun-Ye Gao, Shao-Feng Duan, Yuan-Feng Xu, Ke-Jia Zhu, Shang-Jie Tian, Jia-Cheng Gao, Wen-Hui Fan, Zhi-Cheng Rao, Jie-Rui Huang, Jia-Jun Li, Da-Yu Yan, Zheng-Tai Liu, Wan-Ling Liu, Yao-Bo Huang, Yu-Liang Li, Yi Liu, Guo-Bin Zhang, Peng Zhang, Takeshi Kondo, Shik Shin, He-Chang Lei, You-Guo Shi, Wen-Tao Zhang, Hong-Ming Weng, Tian Qian, Hong Ding
Formato:	article
Lenguaje:	EN
Publicado:	American Physical Society 2019
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/186ab2e9a5504ef89f7ff84e261da54b
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spelling	oai:doaj.org-article:186ab2e9a5504ef89f7ff84e261da54b2021-12-02T13:16:17ZDirac Surface States in Intrinsic Magnetic Topological Insulators EuSn_{2}As_{2} and MnBi_{2n}Te_{3n+1}10.1103/PhysRevX.9.0410392160-3308https://doaj.org/article/186ab2e9a5504ef89f7ff84e261da54b2019-11-01T00:00:00Zhttp://doi.org/10.1103/PhysRevX.9.041039http://doi.org/10.1103/PhysRevX.9.041039https://doaj.org/toc/2160-3308In magnetic topological insulators (TIs), the interplay between magnetic order and nontrivial topology can induce fascinating topological quantum phenomena, such as the quantum anomalous Hall effect, chiral Majorana fermions, and axion electrodynamics. Recently, a great deal of attention has been focused on the intrinsic magnetic TIs, where disorder effects can be eliminated to a large extent, which is expected to facilitate the emergence of topological quantum phenomena. Despite intensive efforts, experimental evidence of the topological surface states (SSs) remains elusive. Here, by combining first-principles calculations and angle-resolved photoemission spectroscopy (ARPES) experiments, we reveal that EuSn_{2}As_{2} is an antiferromagnetic TI with the observation of Dirac SSs consistent with our prediction. We also observe nearly gapless Dirac SSs in antiferromagnetic TIs MnBi_{2n}Te_{3n+1} (n=1 and 2), which are absent in previous ARPES results. These results provide clear evidence for nontrivial topology of these intrinsic magnetic TIs. Furthermore, we find that the topological SSs show no observable changes across the magnetic transition within the experimental resolution, indicating that the magnetic order has a quite small effect on the topological SSs, which can be attributed to weak hybridization between the localized magnetic moments, from either 4f or 3d orbitals, and the topological electronic states. This finding provides insights for further research that the correlations between magnetism and topological states need to be strengthened to induce larger gaps in the topological SSs, which will facilitate the realization of topological quantum phenomena at higher temperatures.Hang LiShun-Ye GaoShao-Feng DuanYuan-Feng XuKe-Jia ZhuShang-Jie TianJia-Cheng GaoWen-Hui FanZhi-Cheng RaoJie-Rui HuangJia-Jun LiDa-Yu YanZheng-Tai LiuWan-Ling LiuYao-Bo HuangYu-Liang LiYi LiuGuo-Bin ZhangPeng ZhangTakeshi KondoShik ShinHe-Chang LeiYou-Guo ShiWen-Tao ZhangHong-Ming WengTian QianHong DingAmerican Physical SocietyarticlePhysicsQC1-999ENPhysical Review X, Vol 9, Iss 4, p 041039 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 Hang Li Shun-Ye Gao Shao-Feng Duan Yuan-Feng Xu Ke-Jia Zhu Shang-Jie Tian Jia-Cheng Gao Wen-Hui Fan Zhi-Cheng Rao Jie-Rui Huang Jia-Jun Li Da-Yu Yan Zheng-Tai Liu Wan-Ling Liu Yao-Bo Huang Yu-Liang Li Yi Liu Guo-Bin Zhang Peng Zhang Takeshi Kondo Shik Shin He-Chang Lei You-Guo Shi Wen-Tao Zhang Hong-Ming Weng Tian Qian Hong Ding Dirac Surface States in Intrinsic Magnetic Topological Insulators EuSn_{2}As_{2} and MnBi_{2n}Te_{3n+1}
description	In magnetic topological insulators (TIs), the interplay between magnetic order and nontrivial topology can induce fascinating topological quantum phenomena, such as the quantum anomalous Hall effect, chiral Majorana fermions, and axion electrodynamics. Recently, a great deal of attention has been focused on the intrinsic magnetic TIs, where disorder effects can be eliminated to a large extent, which is expected to facilitate the emergence of topological quantum phenomena. Despite intensive efforts, experimental evidence of the topological surface states (SSs) remains elusive. Here, by combining first-principles calculations and angle-resolved photoemission spectroscopy (ARPES) experiments, we reveal that EuSn_{2}As_{2} is an antiferromagnetic TI with the observation of Dirac SSs consistent with our prediction. We also observe nearly gapless Dirac SSs in antiferromagnetic TIs MnBi_{2n}Te_{3n+1} (n=1 and 2), which are absent in previous ARPES results. These results provide clear evidence for nontrivial topology of these intrinsic magnetic TIs. Furthermore, we find that the topological SSs show no observable changes across the magnetic transition within the experimental resolution, indicating that the magnetic order has a quite small effect on the topological SSs, which can be attributed to weak hybridization between the localized magnetic moments, from either 4f or 3d orbitals, and the topological electronic states. This finding provides insights for further research that the correlations between magnetism and topological states need to be strengthened to induce larger gaps in the topological SSs, which will facilitate the realization of topological quantum phenomena at higher temperatures.
format	article
author	Hang Li Shun-Ye Gao Shao-Feng Duan Yuan-Feng Xu Ke-Jia Zhu Shang-Jie Tian Jia-Cheng Gao Wen-Hui Fan Zhi-Cheng Rao Jie-Rui Huang Jia-Jun Li Da-Yu Yan Zheng-Tai Liu Wan-Ling Liu Yao-Bo Huang Yu-Liang Li Yi Liu Guo-Bin Zhang Peng Zhang Takeshi Kondo Shik Shin He-Chang Lei You-Guo Shi Wen-Tao Zhang Hong-Ming Weng Tian Qian Hong Ding
author_facet	Hang Li Shun-Ye Gao Shao-Feng Duan Yuan-Feng Xu Ke-Jia Zhu Shang-Jie Tian Jia-Cheng Gao Wen-Hui Fan Zhi-Cheng Rao Jie-Rui Huang Jia-Jun Li Da-Yu Yan Zheng-Tai Liu Wan-Ling Liu Yao-Bo Huang Yu-Liang Li Yi Liu Guo-Bin Zhang Peng Zhang Takeshi Kondo Shik Shin He-Chang Lei You-Guo Shi Wen-Tao Zhang Hong-Ming Weng Tian Qian Hong Ding
author_sort	Hang Li
title	Dirac Surface States in Intrinsic Magnetic Topological Insulators EuSn_{2}As_{2} and MnBi_{2n}Te_{3n+1}
title_short	Dirac Surface States in Intrinsic Magnetic Topological Insulators EuSn_{2}As_{2} and MnBi_{2n}Te_{3n+1}
title_full	Dirac Surface States in Intrinsic Magnetic Topological Insulators EuSn_{2}As_{2} and MnBi_{2n}Te_{3n+1}
title_fullStr	Dirac Surface States in Intrinsic Magnetic Topological Insulators EuSn_{2}As_{2} and MnBi_{2n}Te_{3n+1}
title_full_unstemmed	Dirac Surface States in Intrinsic Magnetic Topological Insulators EuSn_{2}As_{2} and MnBi_{2n}Te_{3n+1}
title_sort	dirac surface states in intrinsic magnetic topological insulators eusn_{2}as_{2} and mnbi_{2n}te_{3n+1}
publisher	American Physical Society
publishDate	2019
url	https://doaj.org/article/186ab2e9a5504ef89f7ff84e261da54b
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Dirac Surface States in Intrinsic Magnetic Topological Insulators EuSn_{2}As_{2} and MnBi_{2n}Te_{3n+1}

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