2007/01/31 by Oskar Vafek
Physics and Astronomy · #cond-mat.mes-hall #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.98.216401
published as Phys. Rev. Lett. 98, 216401 (2007) · 4 pages, 2 figures (replaced with revised version)
arxiv created 2007/04/10 · arxiv updated 2009/12/01
It is argued that the specific heat of N massless Dirac fermions in 2 spatial dimensions interacting with 1/r Coulomb interactions is suppressed logarithmically relative to its non-interacting counterpart. The (dimensionless) coefficient of the logarithm is calculated analytically in the leading order in large N expansion, but to all orders in e2N, a procedure which takes into account finite temperature screening. Experimental observation of 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.