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Dynamical gap generation in a two-dimensional Dirac semimetal with a deformed Dirac
Xiao, Hai-Xiao1,2; Wang, Jing-Rong3; Feng, Hong-Tao4; Yin, Pei-Lin4; Zong, Hong-Shi1,2,5,6
2017-10-10
Source PublicationPHYSICAL REVIEW B
Volume96Issue:15
AbstractAccording to the extensive theoretical and experimental investigations, it is widely accepted that the long-range Coulomb interaction is too weak to generate a dynamical excitonic gap in graphene with a perfect Dirac cone. We study the impact of the deformation of a Dirac cone on dynamical gap generation. When a uniaxial strain is applied to graphene, the Dirac cone is made elliptical on the equal-energy plane, and the fermion velocity becomes anisotropic. The applied uniaxial strain has two effects: It decreases the mean value of fermion velocity; it increases the velocity anisotropy. After solving the Dyson-Schwinger gap equation, we show that dynamical gap generation is promoted by the former effect but suppressed by the latter. For suspended graphene, we find that the system undergoes an excitonic insulating transition when the strain is roughly 7.34%. We also solve the gap equation in case the Dirac cone is tilted, which might be realized in the organic material alpha-( BEDT-TTF) I-2(3) and find that the tilt of the Dirac cone can suppress dynamical gap generation. It turns out that the geometry of the Dirac cone plays an important role in the formation of excitonic pairing.
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
Funding OrganizationNational Natural Science Foundation of China(11475085 ; National Natural Science Foundation of China(11475085 ; Fundamental Research Funds for the Central Universities(020414380074) ; Fundamental Research Funds for the Central Universities(020414380074) ; Natural Science Foundation of Jiangsu Province of China(BK20130387 ; Natural Science Foundation of Jiangsu Province of China(BK20130387 ; Jiangsu Planned Projects for Postdoctoral Research Funds(1501035B) ; Jiangsu Planned Projects for Postdoctoral Research Funds(1501035B) ; 11535005 ; 11535005 ; 1601170B) ; 1601170B) ; 11690030 ; 11690030 ; 11504379) ; 11504379) ; National Natural Science Foundation of China(11475085 ; National Natural Science Foundation of China(11475085 ; Fundamental Research Funds for the Central Universities(020414380074) ; Fundamental Research Funds for the Central Universities(020414380074) ; Natural Science Foundation of Jiangsu Province of China(BK20130387 ; Natural Science Foundation of Jiangsu Province of China(BK20130387 ; Jiangsu Planned Projects for Postdoctoral Research Funds(1501035B) ; Jiangsu Planned Projects for Postdoctoral Research Funds(1501035B) ; 11535005 ; 11535005 ; 1601170B) ; 1601170B) ; 11690030 ; 11690030 ; 11504379) ; 11504379)
DOI10.1103/PhysRevB.96.155114
WOS KeywordRENORMALIZATION-GROUP APPROACH ; FERMI-LIQUID BEHAVIOR ; TOPOLOGICAL INSULATORS ; WEYL SEMIMETALS ; GRAPHENE
Indexed BySCI
Language英语
Funding OrganizationNational Natural Science Foundation of China(11475085 ; National Natural Science Foundation of China(11475085 ; Fundamental Research Funds for the Central Universities(020414380074) ; Fundamental Research Funds for the Central Universities(020414380074) ; Natural Science Foundation of Jiangsu Province of China(BK20130387 ; Natural Science Foundation of Jiangsu Province of China(BK20130387 ; Jiangsu Planned Projects for Postdoctoral Research Funds(1501035B) ; Jiangsu Planned Projects for Postdoctoral Research Funds(1501035B) ; 11535005 ; 11535005 ; 1601170B) ; 1601170B) ; 11690030 ; 11690030 ; 11504379) ; 11504379) ; National Natural Science Foundation of China(11475085 ; National Natural Science Foundation of China(11475085 ; Fundamental Research Funds for the Central Universities(020414380074) ; Fundamental Research Funds for the Central Universities(020414380074) ; Natural Science Foundation of Jiangsu Province of China(BK20130387 ; Natural Science Foundation of Jiangsu Province of China(BK20130387 ; Jiangsu Planned Projects for Postdoctoral Research Funds(1501035B) ; Jiangsu Planned Projects for Postdoctoral Research Funds(1501035B) ; 11535005 ; 11535005 ; 1601170B) ; 1601170B) ; 11690030 ; 11690030 ; 11504379) ; 11504379)
WOS Research AreaPhysics
WOS SubjectPhysics, Condensed Matter
WOS IDWOS:000412699800003
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.hfcas.ac.cn:8080/handle/334002/33702
Collection中科院强磁场科学中心
Affiliation1.Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Key Lab Modern Acoust, Dept Phys,MOE,Inst Acoust, Nanjing 210093, Jiangsu, Peoples R China
2.Nanjing Univ, Dept Phys, Nanjing 210093, Jiangsu, Peoples R China
3.Chinese Acad Sci, High Field Magnet Lab, Anhui Prov Key Lab Condensed Matter Phys Extreme, Hefei, Anhui, Peoples R China
4.Southeast Univ, Dept Phys, Nanjing 211189, Jiangsu, 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, Hai-Xiao,Wang, Jing-Rong,Feng, Hong-Tao,et al. Dynamical gap generation in a two-dimensional Dirac semimetal with a deformed Dirac[J]. PHYSICAL REVIEW B,2017,96(15).
APA Xiao, Hai-Xiao,Wang, Jing-Rong,Feng, Hong-Tao,Yin, Pei-Lin,&Zong, Hong-Shi.(2017).Dynamical gap generation in a two-dimensional Dirac semimetal with a deformed Dirac.PHYSICAL REVIEW B,96(15).
MLA Xiao, Hai-Xiao,et al."Dynamical gap generation in a two-dimensional Dirac semimetal with a deformed Dirac".PHYSICAL REVIEW B 96.15(2017).
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