ITP OpenIR  > 理论物理所2017年知识产出
Dynamical gap generation in a two-dimensional Dirac semimetal with a deformed Dirac
Xiao, HX; Wang, JR; Feng, HT; Yin, PL; Zong, HS; Zong, HS (reprint author), Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Key Lab Modern Acoust, Dept Phys,MOE,Inst Acoust, Nanjing 210093, Jiangsu, Peoples R China.; Zong, HS (reprint author), Nanjing Univ, Dept Phys, Nanjing 210093, Jiangsu, Peoples R China.; Zong, HS (reprint author), Joint Ctr Particle Nucl Phys & Cosmol, Nanjing 210093, Jiangsu, Peoples R China.; Zong, HS (reprint author), Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China.
2017
发表期刊PHYSICAL REVIEW B
卷号96期号:15页码:155114
文章类型Article
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.
学科领域Physics
资助者National Natural Science Foundation of China [11475085, 11535005, 11690030, 11504379] ; National Natural Science Foundation of China [11475085, 11535005, 11690030, 11504379] ; 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, 1601170B] ; Natural Science Foundation of Jiangsu Province of China [BK20130387, 1601170B] ; Jiangsu Planned Projects for Postdoctoral Research Funds [1501035B] ; Jiangsu Planned Projects for Postdoctoral Research Funds [1501035B] ; National Natural Science Foundation of China [11475085, 11535005, 11690030, 11504379] ; National Natural Science Foundation of China [11475085, 11535005, 11690030, 11504379] ; 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, 1601170B] ; Natural Science Foundation of Jiangsu Province of China [BK20130387, 1601170B] ; Jiangsu Planned Projects for Postdoctoral Research Funds [1501035B] ; Jiangsu Planned Projects for Postdoctoral Research Funds [1501035B]
DOIhttp://dx.doi.org/10.1103/PhysRevB.96.155114
关键词[WOS]RENORMALIZATION-GROUP APPROACH ; FERMI-LIQUID BEHAVIOR ; TOPOLOGICAL INSULATORS ; WEYL SEMIMETALS ; GRAPHENE
语种英语
资助者National Natural Science Foundation of China [11475085, 11535005, 11690030, 11504379] ; National Natural Science Foundation of China [11475085, 11535005, 11690030, 11504379] ; 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, 1601170B] ; Natural Science Foundation of Jiangsu Province of China [BK20130387, 1601170B] ; Jiangsu Planned Projects for Postdoctoral Research Funds [1501035B] ; Jiangsu Planned Projects for Postdoctoral Research Funds [1501035B] ; National Natural Science Foundation of China [11475085, 11535005, 11690030, 11504379] ; National Natural Science Foundation of China [11475085, 11535005, 11690030, 11504379] ; 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, 1601170B] ; Natural Science Foundation of Jiangsu Province of China [BK20130387, 1601170B] ; Jiangsu Planned Projects for Postdoctoral Research Funds [1501035B] ; Jiangsu Planned Projects for Postdoctoral Research Funds [1501035B]
WOS类目Physics, Condensed Matter
引用统计
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/21952
专题理论物理所2017年知识产出
通讯作者Zong, HS (reprint author), Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Key Lab Modern Acoust, Dept Phys,MOE,Inst Acoust, Nanjing 210093, Jiangsu, Peoples R China.; Zong, HS (reprint author), Nanjing Univ, Dept Phys, Nanjing 210093, Jiangsu, Peoples R China.; Zong, HS (reprint author), Joint Ctr Particle Nucl Phys & Cosmol, Nanjing 210093, Jiangsu, Peoples R China.; Zong, HS (reprint author), Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China.
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Xiao, HX,Wang, JR,Feng, HT,et al. Dynamical gap generation in a two-dimensional Dirac semimetal with a deformed Dirac[J]. PHYSICAL REVIEW B,2017,96(15):155114.
APA Xiao, HX.,Wang, JR.,Feng, HT.,Yin, PL.,Zong, HS.,...&Zong, HS .(2017).Dynamical gap generation in a two-dimensional Dirac semimetal with a deformed Dirac.PHYSICAL REVIEW B,96(15),155114.
MLA Xiao, HX,et al."Dynamical gap generation in a two-dimensional Dirac semimetal with a deformed Dirac".PHYSICAL REVIEW B 96.15(2017):155114.
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