Knowledge Management System of Institute of Theoretical Physics, CAS
| Xiao, HX; Wang, JR; Liu, GZ; Zong, HS | |
| Robustness of the semimetal state of Na3Bi and Cd3As2 against Coulomb interactions | |
| Source Publication | PHYSICAL REVIEW B
 |
| Language | 英语 |
| Keyword | TOPOLOGICAL PHASE-TRANSITION DIRAC SEMIMETAL EXCITONIC INSTABILITY OPTICAL-PROPERTIES WEYL SEMIMETALS GRAPHENE FERMIONS DISCOVERY INSULATOR |
| Abstract | 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 | |
| ISSN | 2469-9950 |
| Volume | 97Issue:15Pages:155122 |
| Subject Area | Materials Science ; Physics |
| MOST Discipline Catalogue | Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter |
| DOI | 10.1103/PhysRevB.97.155122 |
| Indexed By | SCIE |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.itp.ac.cn/handle/311006/22926 |
| Collection | SCI期刊论文 |
| Affiliation | 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 |
| 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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