期刊
PHYSICAL REVIEW LETTERS
卷 111, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.111.056801
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资金
- Federal Special-Purpose Program Cadres of the Russian Ministry of Science and Education
- FAIR-Russia Research Center
- Alexander von Humboldt Foundation
- Ministry for Education and Research of the German Federal Republic
- Stichting Fundamenteel Onderzoek der Materie (FOM), The Netherlands
- [RFBR-11-02-01227-a]
- [RFBR-12-02-31249]
- [RFBR-13-02-01387]
We report on the results of the first-principles numerical study of spontaneous breaking of chiral (sublattice) symmetry in suspended monolayer graphene due to electrostatic interaction, which takes into account the screening of Coulomb potential by electrons on sigma orbitals. In contrast to the results of previous numerical simulations with unscreened potential, we find that suspended graphene is in the conducting phase with unbroken chiral symmetry. This finding is in agreement with recent experimental results by the Manchester group [D. C. Elias et al., Nat. Phys. 7, 701 (2011); A. S. Mayorov et al., Nano Lett. 12, 4629 (2012)]. Further, by artificially increasing the interaction strength, we demonstrate that suspended graphene is quite close to the phase transition associated with spontaneous chiral symmetry breaking, which suggests that fluctuations of chirality and nonperturbative effects might still be quite important.
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