2008/11/30 by Guo-Zhu Liu, Wei Li, Geng Cheng · 3 citations
Materials Science · Physics and Astronomy · #Condensed matter physics #Coulomb #Coupling (piping) #Dirac fermion #Electron #Fermion #Graphene #Graphene research and applications #Massless particle #Materials science #Physics #Quantum and electron transport phenomena #Quantum mechanics #Topological Materials and Phenomena #cond-mat.mes-hall #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.79.205429
published as Phys. Rev. B 79, 205429 (2009) · 7 pages, 4 figures, to appear in Phys. Rev. B
arxiv created 2009/05/11 · openalex publication_date 2009/05/28 · arxiv updated 2015/05/12 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The strong long-range Coulomb interaction between massless Dirac fermions in graphene can drive a semimetal-insulator transition. We show that this transition is strongly suppressed when the Coulomb interaction is screened by such effects as thermal fluctuation, doping, disorder, and finite volume. It is completely suppressed once the screening factor \ensuremathμ is beyond a threshold \ensuremathμc even for infinitely strong coupling. However, such transition is still possible if there is an additional strong contact four-fermion interaction. The differences between screened and contact interactions are also discussed.