Interplay of superconductivity and spin density wave order in doped graphene
Abstract
We study the interplay between superconductivity and spin density wave order in graphene doped to 3/8 or 5/8 filling (a Van Hove doping). At this doping level, the system is known to exhibit weak coupling instabilities to both chiral d + id superconductivity and to a uniaxial spin density wave. Right at van Hove doping, the superconducting instability is strongest and emerges at the highest Tc, but slightly away from van-Hove doping a spin-density-wave likely emerges first. We investigate whether at some lower temperature superconductivity and spin-density-waves co-exist. We derive the Landau-Ginzburg functional describing interplay of the two order parameters. Our calculations show that superconductivity and spin density wave order do not co-exist and are separated by first-order transitions, either as a function of doping or as a function of T.
Keywords
Cite
@article{arxiv.1207.5802,
title = {Interplay of superconductivity and spin density wave order in doped graphene},
author = {Rahul Nandkishore and Andrey V. Chubukov},
journal= {arXiv preprint arXiv:1207.5802},
year = {2012}
}