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	Excitonic pairing and insulating transition in two-dimensional semi-Dirac semimetals
	Wang, Jing-Rong1,2; Liu, Guo-Zhu2; Zhang, Chang-Jin1,3
刊名	PHYSICAL REVIEW B
	2017-02-15
卷号	95期号:7页码:1-24
DOI	10.1103/PhysRevB.95.075129
文献子类	Article
英文摘要	A sufficiently strong long-range Coulomb interaction can induce excitonic pairing in gapless Dirac semimetals, which generates a finite gap and drives the semimetal-insulator quantum phase transition. This phenomenon is in close analogy to dynamical chiral symmetry breaking in high-energy physics. In most realistic Dirac semimetals, including suspended graphene, the Coulomb interaction is too weak to open an excitonic gap. The Coulomb interaction plays a more important role at low energies in a two-dimensional semi-Dirac semimetal, in which the fermion spectrum is linear in one component of momenta and quadratic in the other, than a Dirac semimetal, and indeed leads to breakdown of Fermi liquid theory. We study dynamical excitonic gap generation in a two-dimensional semi-Dirac semimetal by solving the Dyson-Schwinger equation, and show that a moderately strong Coulomb interaction suffices to induce excitonic pairing. Additional short-range four-fermion coupling tends to promote excitonic pairing. Among the available semi-Dirac semimetals, we find that the TiO2/VO2 nanostructure provides a promising candidate for the realization of an excitonic insulator. We also apply the renormalization group method to analyze the strong coupling between the massless semi-Dirac fermions and the quantum critical fluctuation of the excitonic order parameter at the semimetal-insulator quantum critical point, and reveal non-Fermi liquid behaviors of semi-Dirac fermions.
WOS关键词	RENORMALIZATION-GROUP APPROACH ; TOPOLOGICAL PHASE-TRANSITIONS ; DYSON-SCHWINGER EQUATIONS ; LAYER BLACK PHOSPHORUS ; FERMI-LIQUID BEHAVIOR ; CUPRATE SUPERCONDUCTORS ; QUANTUM CRITICALITY ; HONEYCOMB LATTICE ; SYMMETRY-BREAKING ; WEYL SEMIMETAL
WOS研究方向	Physics
语种	英语
WOS记录号	WOS:000393943600005
资助机构	National Key Research and Development Program of China(2016YFA0300404) ; National Key Research and Development Program of China(2016YFA0300404) ; National Key Research and Development Program of China(2016YFA0300404) ; National Key Research and Development Program of China(2016YFA0300404) ; National Key Research and Development Program of China(2016YFA0300404) ; National Key Research and Development Program of China(2016YFA0300404) ; National Key Research and Development Program of China(2016YFA0300404) ; National Key Research and Development Program of China(2016YFA0300404) ; National Natural Science Foundation of China(11574285 ; National Natural Science Foundation of China(11574285 ; National Natural Science Foundation of China(11574285 ; National Natural Science Foundation of China(11574285 ; National Natural Science Foundation of China(11574285 ; National Natural Science Foundation of China(11574285 ; National Natural Science Foundation of China(11574285 ; National Natural Science Foundation of China(11574285 ; Natural Science Foundation of Anhui Province(1608085MA19) ; Natural Science Foundation of Anhui Province(1608085MA19) ; Natural Science Foundation of Anhui Province(1608085MA19) ; Natural Science Foundation of Anhui Province(1608085MA19) ; Natural Science Foundation of Anhui Province(1608085MA19) ; Natural Science Foundation of Anhui Province(1608085MA19) ; Natural Science Foundation of Anhui Province(1608085MA19) ; Natural Science Foundation of Anhui Province(1608085MA19) ; 11274286 ; 11274286 ; 11274286 ; 11274286 ; 11274286 ; 11274286 ; 11274286 ; 11274286 ; 11504379 ; 11504379 ; 11504379 ; 11504379 ; 11504379 ; 11504379 ; 11504379 ; 11504379 ; 11674327 ; 11674327 ; 11674327 ; 11674327 ; 11674327 ; 11674327 ; 11674327 ; 11674327 ; U1532267) ; U1532267) ; U1532267) ; U1532267) ; U1532267) ; U1532267) ; U1532267) ; U1532267) ; National Key Research and Development Program of China(2016YFA0300404) ; National Key Research and Development Program of China(2016YFA0300404) ; National Key Research and Development Program of China(2016YFA0300404) ; National Key Research and Development Program of China(2016YFA0300404) ; National Key Research and Development Program of China(2016YFA0300404) ; National Key Research and Development Program of China(2016YFA0300404) ; National Key Research and Development Program of China(2016YFA0300404) ; National Key Research and Development Program of China(2016YFA0300404) ; National Natural Science Foundation of China(11574285 ; National Natural Science Foundation of China(11574285 ; National Natural Science Foundation of China(11574285 ; National Natural Science Foundation of China(11574285 ; National Natural Science Foundation of China(11574285 ; National Natural Science Foundation of China(11574285 ; National Natural Science Foundation of China(11574285 ; National Natural Science Foundation of China(11574285 ; Natural Science Foundation of Anhui Province(1608085MA19) ; Natural Science Foundation of Anhui Province(1608085MA19) ; Natural Science Foundation of Anhui Province(1608085MA19) ; Natural Science Foundation of Anhui Province(1608085MA19) ; Natural Science Foundation of Anhui Province(1608085MA19) ; Natural Science Foundation of Anhui Province(1608085MA19) ; Natural Science Foundation of Anhui Province(1608085MA19) ; Natural Science Foundation of Anhui Province(1608085MA19) ; 11274286 ; 11274286 ; 11274286 ; 11274286 ; 11274286 ; 11274286 ; 11274286 ; 11274286 ; 11504379 ; 11504379 ; 11504379 ; 11504379 ; 11504379 ; 11504379 ; 11504379 ; 11504379 ; 11674327 ; 11674327 ; 11674327 ; 11674327 ; 11674327 ; 11674327 ; 11674327 ; 11674327 ; U1532267) ; U1532267) ; U1532267) ; U1532267) ; U1532267) ; U1532267) ; U1532267) ; U1532267)
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/32843]
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.Chinese Acad Sci, Hefei Inst Phys Sci, High Field Magnet Lab, Hefei 230031, Anhui, Peoples R China 2.Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Anhui, Peoples R China 3.Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	Wang, Jing-Rong,Liu, Guo-Zhu,Zhang, Chang-Jin. Excitonic pairing and insulating transition in two-dimensional semi-Dirac semimetals[J]. PHYSICAL REVIEW B,2017,95(7):1-24.
APA	Wang, Jing-Rong,Liu, Guo-Zhu,&Zhang, Chang-Jin.(2017).Excitonic pairing and insulating transition in two-dimensional semi-Dirac semimetals.PHYSICAL REVIEW B,95(7),1-24.
MLA	Wang, Jing-Rong,et al."Excitonic pairing and insulating transition in two-dimensional semi-Dirac semimetals".PHYSICAL REVIEW B 95.7(2017):1-24.

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