期刊
PHYSICAL REVIEW LETTERS
卷 102, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.102.026802
关键词
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资金
- U. S. DOE [DE-FG-02-97ER41014, DE-FG02-00ER41132, DE-AC02-05CH11231]
- UNEDF SciDAC [DE-FC02-07ER41457]
- NSF [PHY-0653312]
- Ohio Supercomputer Center
We present evidence, from lattice Monte Carlo simulations of the phase diagram of graphene as a function of the Coulomb coupling between quasiparticles, that graphene in vacuum is likely to be an insulator. We find a semimetal-insulator transition at alpha(crit)(g)=1.11 +/- 0.06, where alpha(g)similar or equal to 2.16 in vacuum, and alpha(g)similar or equal to 0.79 on a SiO2 substrate. Our analysis uses the logarithmic derivative of the order parameter, supplemented by an equation of state. The insulating phase disappears above a critical number of four-component fermion flavors 4 < N-f(crit)< 6. Our data are consistent with a second-order transition.
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