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VOLUME 88 (2008) | ISSUE 11 | PAGE 862
Proximity-induced superconductivity in graphene
PACS: 74.20.-z, 74.78.-w, 74.81.-g
Abstract
We propose a way of making graphene superconductive by putting on it small superconductive islands which cover a tiny fraction of graphene area. We show that the critical temperature, Tc, can reach several Kelvins at the experimentally accessible range of parameters. At low temperatures, T \ll T_c, and zero magnetic field, the density of states is characterized by a small gap E_g \leq T_c resulting from the collective proximity effect. Transverse magnetic field H_{g}(T) \propto E_g is expected to destroy the spectral gap driving graphene layer to a kind of a superconductive glass state. Melting of the glass state into a metal occurs at a higher field Hg2(T).