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

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	Strong Anisotropy of Dirac Cones in SrMnBi2 and CaMnBi2 Revealed by Angle-Resolved Photoemission Spectroscopy
	Feng, Y ; Wang, ZJ ; Chen, CY ; Shi, YG ; Xie, ZJ ; Yi, HM ; Liang, AJ ; He, SL ; He, JF ; Peng, YY ; Liu, X ; Liu, Y ; Zhao, L ; Liu, GD ; Dong, XL ; Zhang, J ; Chen, CT ; Xu, ZY ; Dai, X ; Fang, Z ; Zhou, XJ
刊名	SCIENTIFIC REPORTS
	2014
卷号	4
ISSN号	2045-2322
通讯作者	Zhou, XJ (reprint author), Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China.
中文摘要	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 AMnBi(2) (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 AMnBi(2) system that can be governed by the spin-orbital coupling and the local environment surrounding the Bi square net.
资助信息	National Natural Science Foundation of China [91021006, 10974239, 11174346, 11274367]; Ministry of Science and Technology of China [2011CB921703, 2013CB921700, 2013CB921904]
语种	英语
公开日期	2015-04-14
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/59713]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Feng, Y,Wang, ZJ,Chen, CY,et al. Strong Anisotropy of Dirac Cones in SrMnBi2 and CaMnBi2 Revealed by Angle-Resolved Photoemission Spectroscopy[J]. SCIENTIFIC REPORTS,2014,4.
APA	Feng, Y.,Wang, ZJ.,Chen, CY.,Shi, YG.,Xie, ZJ.,...&Zhou, XJ.(2014).Strong Anisotropy of Dirac Cones in SrMnBi2 and CaMnBi2 Revealed by Angle-Resolved Photoemission Spectroscopy.SCIENTIFIC REPORTS,4.
MLA	Feng, Y,et al."Strong Anisotropy of Dirac Cones in SrMnBi2 and CaMnBi2 Revealed by Angle-Resolved Photoemission Spectroscopy".SCIENTIFIC REPORTS 4(2014).