Robustness of the semimetal state of Na3Bi and Cd3As2 against Coulomb interactions

doi:10.1103/PhysRevB.97.155122

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	Robustness of the semimetal state of Na3Bi and Cd3As2 against Coulomb interactions
	Zong, HS ; Xiao, HX ; Wang, JR ; Liu, GZ
刊名	PHYSICAL REVIEW B
	2018
卷号	97 期号:15 页码:155122
关键词	TOPOLOGICAL PHASE-TRANSITION DIRAC SEMIMETAL EXCITONIC INSTABILITY OPTICAL-PROPERTIES WEYL SEMIMETALS GRAPHENE FERMIONS DISCOVERY INSULATOR
ISSN号	2469-9950
DOI	10.1103/PhysRevB.97.155122
英文摘要	We study the excitonic semimetal-insulator quantum phase transition in a three-dimensional Dirac semimetal in which the fermion dispersion is strongly anisotropic. After solving the Dyson-Schwinger equation for the excitonic gap, we obtain a global phase diagram in the plane spanned by the parameter for Coulomb interaction strength and the parameter for fermion velocity anisotropy. We find that excitonic gap generation is promoted as the interaction becomes stronger but is suppressed if the anisotropy increases. Applying our results to two realistic three-dimensional Dirac semimetals Na3Bi and Cd3As2, we establish that their exact zero-temperature ground state is gapless semimetal rather than excitonic insulator. Moreover, these two materials are far from the excitonic quantum critical point, and thus there should not be any observable evidence for excitonic insulating behavior. This conclusion is in general agreement with the existing experiments of Na3Bi and Cd3As2.
学科主题	Materials Science ; Physics
语种	英语
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/22926]
专题	理论物理研究所_理论物理所1978-2010年知识产出
作者单位	1.Joint Ctr Particle Nucl Phys & Cosmol, Nanjing 210093, Jiangsu, Peoples R China 2.Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Anhui, Peoples R China 3.Chinese Acad Sci, Anhui Prov Key Lab Condensed Matter Phys Extreme, High Magnet Field Lab, Hefei 230031, Anhui, Peoples R China 4.Nanjing Univ, Dept Phys, Nanjing 210093, Jiangsu, Peoples R China 5.[Xiao, Hai-Xiao 6.Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Zong, HS,Xiao, HX,Wang, JR,et al. Robustness of the semimetal state of Na3Bi and Cd3As2 against Coulomb interactions[J]. PHYSICAL REVIEW B,2018,97(15):155122.
APA	Zong, HS,Xiao, HX,Wang, JR,&Liu, GZ.(2018).Robustness of the semimetal state of Na3Bi and Cd3As2 against Coulomb interactions.PHYSICAL REVIEW B,97(15),155122.
MLA	Zong, HS,et al."Robustness of the semimetal state of Na3Bi and Cd3As2 against Coulomb interactions".PHYSICAL REVIEW B 97.15(2018):155122.