Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-11-27
Phys. Rev. B 79, 205429 (2009)
Physics
Condensed Matter
Strongly Correlated Electrons
7 pages, 4 figures, to appear in Phys. Rev. B
Scientific paper
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 disorder, thermal fluctuation, doping, and finite volume. It is completely suppressed once the screening factor $\mu$ is beyond a threshold $\mu_{c}$ 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.
Cheng Geng
Li Wangrong
Liu Guo-Zhu
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