Dynamical gap generation in a two-dimensional Dirac semimetal with a deformed Dirac

doi:http://dx.doi.org/10.1103/PhysRevB.96.155114

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	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.
刊名	PHYSICAL REVIEW B
	2017
卷号	96 期号:15 页码:155114
DOI	http://dx.doi.org/10.1103/PhysRevB.96.155114
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.
学科主题	Physics
语种	英语
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/21952]
专题	理论物理研究所_理论物理所1978-2010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.
推荐引用方式 GB/T 7714	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.