ITP OpenIR  > SCI期刊论文
Xiao, HX; Wang, JR; Liu, GZ; Zong, HS
Robustness of the semimetal state of Na3Bi and Cd3As2 against Coulomb interactions
Source PublicationPHYSICAL REVIEW B
Language英语
KeywordTOPOLOGICAL PHASE-TRANSITION DIRAC SEMIMETAL EXCITONIC INSTABILITY OPTICAL-PROPERTIES WEYL SEMIMETALS GRAPHENE FERMIONS DISCOVERY INSULATOR
AbstractWe 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.
2018
ISSN2469-9950
Volume97Issue:15Pages:155122
Subject AreaMaterials Science ; Physics
MOST Discipline CatalogueMaterials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter
DOI10.1103/PhysRevB.97.155122
Indexed BySCIE
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Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/22926
CollectionSCI期刊论文
Affiliation1.[Xiao, Hai-Xiao
2.Nanjing Univ, Dept Phys, Nanjing 210093, Jiangsu, 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.Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Anhui, Peoples R China
5.Joint Ctr Particle Nucl Phys & Cosmol, Nanjing 210093, Jiangsu, Peoples R China
6.Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Xiao, HX,Wang, JR,Liu, GZ,et al. Robustness of the semimetal state of Na3Bi and Cd3As2 against Coulomb interactions[J]. PHYSICAL REVIEW B,2018,97(15):155122.
APA Xiao, HX,Wang, JR,Liu, GZ,&Zong, HS.(2018).Robustness of the semimetal state of Na3Bi and Cd3As2 against Coulomb interactions.PHYSICAL REVIEW B,97(15),155122.
MLA Xiao, HX,et al."Robustness of the semimetal state of Na3Bi and Cd3As2 against Coulomb interactions".PHYSICAL REVIEW B 97.15(2018):155122.
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