期刊
JOURNAL OF PHYSICS-CONDENSED MATTER
卷 26, 期 42, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/0953-8984/26/42/423201
关键词
graphene; dopants; superconductivity; topological
资金
- Swedish Research Council (VR)
- German Research Foundation (DFG)
A highly unconventional superconducting state with a spin-singlet d(x2-y2) +/- id(xy)-wave, or chiral d-wave symmetry has recently been suggested to emerge from electron-electron interactions in doped graphene. It has been argued that graphene doped to the van Hove singularity at 1/4 doping, where the density of states diverge, is particularly likely to be a chiral d-wave superconductor. In this review we summarize the currently mounting theoretical evidence for the existence of a chiral d-wave superconducting state in graphene, obtained with methods ranging from mean-field studies of effective Hamiltonians to angle-resolved renormalization group calculations. We further discuss the multiple distinctive properties of the chiral d-wave superconducting state in graphene, as well as its stability in the presence of disorder. We also review the means of enhancing the chiral d-wave state using proximity-induced superconductivity. The appearance of chiral d-wave superconductivity is intimately linked to the hexagonal crystal lattice and we also offer a brief overview of other materials which have also been proposed to be chiral d-wave superconductors.
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