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Xiao, HX; Wang, JR; Liu, GZ; Zong, HS
Robustness of the semimetal state of Na3Bi and Cd3As2 against Coulomb interactions
发表期刊PHYSICAL REVIEW B
语种英语
关键词TOPOLOGICAL PHASE-TRANSITION DIRAC SEMIMETAL EXCITONIC INSTABILITY OPTICAL-PROPERTIES WEYL SEMIMETALS GRAPHENE FERMIONS DISCOVERY INSULATOR
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.
2018
ISSN2469-9950
卷号97期号:15页码:155122
学科领域Materials Science ; Physics
学科门类Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter
DOI10.1103/PhysRevB.97.155122
收录类别SCIE
引用统计
被引频次:2[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/22926
专题理论物理所科研产出_SCI论文
作者单位1.[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
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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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