Is Graphene in Vacuum an Insulator?

被引：238

作者：

Drut, Joaquin E. ^{[1
]}

Lahde, Timo A. ^{[2
]}

机构：

[1] Ohio State Univ, Dept Phys, Columbus, OH 43210 USA

[2] Univ Washington, Dept Phys, Seattle, WA 98195 USA

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 02期

关键词：

RENORMALIZATION-GROUP FLOW; FERMI-LIQUID BEHAVIOR; LATTICE FERMIONS; CONTINUUM-LIMIT; GRAPHITE; PHASE; DIMENSIONS; TRANSITION; SIMULATION; NEUTRINOS;

D O I：

10.1103/PhysRevLett.102.026802

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页数：4

共 44 条

[1]

[Anonymous], 2005, Lattice Gauge Theories: An Introduction

[2] Quasiparticle dynamics in graphene [J].