Strong Anisotropy of Dirac Cones in SrMnBi2 and CaMnBi2 Revealed by Angle-Resolved Photoemission Spectroscopy

The Dirac materials, such as graphene and three-dimensional topological insulators, have attracted much attention because they exhibit novel quantum phenomena with their low energy electrons governed by the relativistic Dirac equations. One particular interest is to generate Dirac cone anisotropy so...

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Main Authors:	Feng, Ya, Wang, Zhijun, Chen, Chaoyu, Shi, Youguo, Xie, Zhuojin, Yi, Hemian, Liang, Aiji, He, Shaolong, He, Junfeng, Peng, Yingying, Liu, Xu, Liu, Yan, Zhao, Lin, Liu, Guodong, Dong, Xiaoli, Zhang, Jun, Chen, Chuangtian, Xu, Zuyan, Dai, Xi, Fang, Zhong, Zhou, X. J.
Format:	Online
Language:	English
Published:	Nature Publishing Group 2014
Online Access:	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4064355/

id	pubmed-4064355
recordtype	oai_dc
spelling	pubmed-40643552014-06-23 Strong Anisotropy of Dirac Cones in SrMnBi2 and CaMnBi2 Revealed by Angle-Resolved Photoemission Spectroscopy Feng, Ya Wang, Zhijun Chen, Chaoyu Shi, Youguo Xie, Zhuojin Yi, Hemian Liang, Aiji He, Shaolong He, Junfeng Peng, Yingying Liu, Xu Liu, Yan Zhao, Lin Liu, Guodong Dong, Xiaoli Zhang, Jun Chen, Chuangtian Xu, Zuyan Dai, Xi Fang, Zhong Zhou, X. J. Article The Dirac materials, such as graphene and three-dimensional topological insulators, have attracted much attention because they exhibit novel quantum phenomena with their low energy electrons governed by the relativistic Dirac equations. One particular interest is to generate Dirac cone anisotropy so that the electrons can propagate differently from one direction to the other, creating an additional tunability for new properties and applications. While various theoretical approaches have been proposed to make the isotropic Dirac cones of graphene into anisotropic ones, it has not yet been met with success. There are also some theoretical predictions and/or experimental indications of anisotropic Dirac cone in novel topological insulators and AMnBi2 (A = Sr and Ca) but more experimental investigations are needed. Here we report systematic high resolution angle-resolved photoemission measurements that have provided direct evidence on the existence of strongly anisotropic Dirac cones in SrMnBi2 and CaMnBi2. Distinct behaviors of the Dirac cones between SrMnBi2 and CaMnBi2 are also observed. These results have provided important information on the strong anisotropy of the Dirac cones in AMnBi2 system that can be governed by the spin-orbital coupling and the local environment surrounding the Bi square net. Nature Publishing Group 2014-06-20 /pmc/articles/PMC4064355/ /pubmed/24947490 http://dx.doi.org/10.1038/srep05385 Text en Copyright © 2014, Macmillan Publishers Limited. All rights reserved http://creativecommons.org/licenses/by-nc-nd/4.0/ This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder in order to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/4.0/
repository_type	Open Access Journal
institution_category	Foreign Institution
institution	US National Center for Biotechnology Information
building	NCBI PubMed
collection	Online Access
language	English
format	Online
author	Feng, Ya Wang, Zhijun Chen, Chaoyu Shi, Youguo Xie, Zhuojin Yi, Hemian Liang, Aiji He, Shaolong He, Junfeng Peng, Yingying Liu, Xu Liu, Yan Zhao, Lin Liu, Guodong Dong, Xiaoli Zhang, Jun Chen, Chuangtian Xu, Zuyan Dai, Xi Fang, Zhong Zhou, X. J.
spellingShingle	Feng, Ya Wang, Zhijun Chen, Chaoyu Shi, Youguo Xie, Zhuojin Yi, Hemian Liang, Aiji He, Shaolong He, Junfeng Peng, Yingying Liu, Xu Liu, Yan Zhao, Lin Liu, Guodong Dong, Xiaoli Zhang, Jun Chen, Chuangtian Xu, Zuyan Dai, Xi Fang, Zhong Zhou, X. J. Strong Anisotropy of Dirac Cones in SrMnBi2 and CaMnBi2 Revealed by Angle-Resolved Photoemission Spectroscopy
author_facet	Feng, Ya Wang, Zhijun Chen, Chaoyu Shi, Youguo Xie, Zhuojin Yi, Hemian Liang, Aiji He, Shaolong He, Junfeng Peng, Yingying Liu, Xu Liu, Yan Zhao, Lin Liu, Guodong Dong, Xiaoli Zhang, Jun Chen, Chuangtian Xu, Zuyan Dai, Xi Fang, Zhong Zhou, X. J.
author_sort	Feng, Ya
title	Strong Anisotropy of Dirac Cones in SrMnBi2 and CaMnBi2 Revealed by Angle-Resolved Photoemission Spectroscopy
title_short	Strong Anisotropy of Dirac Cones in SrMnBi2 and CaMnBi2 Revealed by Angle-Resolved Photoemission Spectroscopy
title_full	Strong Anisotropy of Dirac Cones in SrMnBi2 and CaMnBi2 Revealed by Angle-Resolved Photoemission Spectroscopy
title_fullStr	Strong Anisotropy of Dirac Cones in SrMnBi2 and CaMnBi2 Revealed by Angle-Resolved Photoemission Spectroscopy
title_full_unstemmed	Strong Anisotropy of Dirac Cones in SrMnBi2 and CaMnBi2 Revealed by Angle-Resolved Photoemission Spectroscopy
title_sort	strong anisotropy of dirac cones in srmnbi2 and camnbi2 revealed by angle-resolved photoemission spectroscopy
description	The Dirac materials, such as graphene and three-dimensional topological insulators, have attracted much attention because they exhibit novel quantum phenomena with their low energy electrons governed by the relativistic Dirac equations. One particular interest is to generate Dirac cone anisotropy so that the electrons can propagate differently from one direction to the other, creating an additional tunability for new properties and applications. While various theoretical approaches have been proposed to make the isotropic Dirac cones of graphene into anisotropic ones, it has not yet been met with success. There are also some theoretical predictions and/or experimental indications of anisotropic Dirac cone in novel topological insulators and AMnBi2 (A = Sr and Ca) but more experimental investigations are needed. Here we report systematic high resolution angle-resolved photoemission measurements that have provided direct evidence on the existence of strongly anisotropic Dirac cones in SrMnBi2 and CaMnBi2. Distinct behaviors of the Dirac cones between SrMnBi2 and CaMnBi2 are also observed. These results have provided important information on the strong anisotropy of the Dirac cones in AMnBi2 system that can be governed by the spin-orbital coupling and the local environment surrounding the Bi square net.
publisher	Nature Publishing Group
publishDate	2014
url	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4064355/
_version_	1612104009157443584

Strong Anisotropy of Dirac Cones in SrMnBi2 and CaMnBi2 Revealed by Angle-Resolved Photoemission Spectroscopy

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