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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
发表期刊PHYSICAL REVIEW B
卷号96期号:15
摘要According 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.
文章类型Article
WOS标题词Science & Technology ; Physical Sciences
资助者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) ; 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
关键词[WOS]RENORMALIZATION-GROUP APPROACH ; FERMI-LIQUID BEHAVIOR ; TOPOLOGICAL INSULATORS ; WEYL SEMIMETALS ; GRAPHENE
收录类别SCI
语种英语
资助者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) ; 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研究方向Physics
WOS类目Physics, Condensed Matter
WOS记录号WOS:000412699800003
引用统计
被引频次:3[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.hfcas.ac.cn:8080/handle/334002/33696
专题中科院强磁场科学中心
作者单位1.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
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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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