10.1088/1361-648X/aa532f
Wysokiński, Marcin
Marcin
Wysokiński
Kaczmarczyk, Jan
Jan
Kaczmarczyk0000-0002-1629-3675
Unconventional superconductivity in generalized Hubbard model role of electron–hole symmetry breaking terms
IOP Publishing Ltd.
2017
2018-12-11T11:50:29Z
2020-01-21T11:33:14Z
journal_article
https://research-explorer.app.ist.ac.at/record/1163
https://research-explorer.app.ist.ac.at/record/1163.json
09538984
We investigate the effect of the electron-hole (e-h) symmetry breaking on d-wave superconductivity induced by non-local effects of correlations in the generalized Hubbard model. The symmetry breaking is introduced in a two-fold manner: by the next-to-nearest neighbor hopping of electrons and by the charge-bond interaction - the off-diagonal term of the Coulomb potential. Both terms lead to a pronounced asymmetry of the superconducting order parameter. The next-to-nearest neighbor hopping enhances superconductivity for h-doping, while diminishes it for e-doping. The charge-bond interaction alone leads to the opposite effect and, additionally, to the kinetic-energy gain upon condensation in the underdoped regime. With both terms included, with similar amplitudes, the height of the superconducting dome and the critical doping remain in favor of h-doping. The influence of the charge-bond interaction on deviations from symmetry of the shape of the gap at the Fermi surface in the momentum space is briefly discussed.