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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
刊名PHYSICAL REVIEW B
2017-10-10
卷号96期号:15
DOI10.1103/PhysRevB.96.155114
文献子类Article
英文摘要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.
WOS关键词RENORMALIZATION-GROUP APPROACH ; FERMI-LIQUID BEHAVIOR ; TOPOLOGICAL INSULATORS ; WEYL SEMIMETALS ; GRAPHENE
WOS研究方向Physics
语种英语
WOS记录号WOS:000412699800003
资助机构National Natural Science Foundation of China(11475085 ; National Natural Science Foundation of China(11475085 ; National Natural Science Foundation of China(11475085 ; National Natural Science Foundation of China(11475085 ; National Natural Science Foundation of China(11475085 ; National Natural Science Foundation of China(11475085 ; National Natural Science Foundation of China(11475085 ; National Natural Science Foundation of China(11475085 ; National Natural Science Foundation of China(11475085 ; National Natural Science Foundation of China(11475085 ; National Natural Science Foundation of China(11475085 ; National Natural Science Foundation of China(11475085 ; National Natural Science Foundation of China(11475085 ; National Natural Science Foundation of China(11475085 ; National Natural Science Foundation of China(11475085 ; National Natural Science Foundation of China(11475085 ; National Natural Science Foundation of China(11475085 ; National Natural Science Foundation of China(11475085 ; 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内容类型期刊论文
源URL[http://ir.hfcas.ac.cn:8080/handle/334002/33696]  
专题合肥物质科学研究院_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
推荐引用方式
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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