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Phys Rev Lett. 2007 May 25;98(21):216401. Epub 2007 May 21.

Anomalous thermodynamics of Coulomb-interacting massless Dirac fermions in two spatial dimensions.

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  • 1National High Magnetic Field Laboratory and Department of Physics, Florida State University, Tallahassee, Florida 32306, USA.

Abstract

It is argued that the specific heat of N massless Dirac fermions in two spatial dimensions interacting with 1/r Coulomb interactions is suppressed logarithmically relative to its noninteracting counterpart. The (dimensionless) coefficient of the logarithm is calculated in a closed form in the leading order in large N expansion, but to all orders in the effective fine structure constant, alpha(F), a procedure which takes into account finite temperature screening. This effect is expected to occur in a single-layer graphene embedded in a dielectric medium. Its dependence on the dielectric constant is calculated analytically.

PMID:
17677790
DOI:
10.1103/PhysRevLett.98.216401
[PubMed]
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