Electron-electron and electron-hole pairing in graphene structures.
The superconducting pairing of electrons in doped graphene owing to in-plane and out-of-plane phonons is considered. It is shown that the structure of the order parameter in the valley space substantially affects conditions of the pairing. Electron-hole pairing in a graphene bilayer in the strong coupling regime is also considered. Taking into account retardation of the screened Coulomb pairing potential shows a significant competition between the electron-hole direct attraction and their repulsion owing to virtual plasmons and single-particle excitations.
Institute of Spectroscopy, Russian Academy of Sciences, 142190 Troitsk, Moscow Region, Russia. lozovik@isan.troitsk.ru
Yu E
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Lozovik
S L
SL
Ogarkov
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Sokolik