Antiferromagnetic to superconducting phase transition in the hole- and electron-doped Hubbard model at zero temperature

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dc.creatorAichhorn, M.
dc.creatorArrigoni, E.
dc.creatorPotthoff, M.
dc.creatorHanke, W.
dc.date2005-11-18
dc.date2006-06-06
dc.date.accessioned2026-07-07T06:49:18Z
dc.date.available2026-07-07T06:49:18Z
dc.descriptionThe competition between d-wave superconductivity (SC) and antiferromagnetism (AF) in the high-Tc cuprates is investigated by studying the hole- and electron-doped two-dimensional Hubbard model with a recently proposed variational quantum-cluster theory. The approach is shown to provide a thermodynamically consistent determination of the particle number, provided that an overall shift of the on-site energies is treated as a variational parameter. The consequences for the single-particle excitation spectra and for the phase diagram are explored. By comparing the single-particle spectra with quantum Monte-Carlo (QMC) and experimental data, we verify that the low-energy excitations in a strongly-correlated electronic system are described appropriately. The cluster calculations also reproduce the overall ground-state phase diagram of the high-temperature superconductors. In particular, they include salient features such as the enhanced robustness of the antiferromagnetic state as a function of electron doping and the tendency towards phase separation into a mixed antiferromagnetic-superconducting phase at low-doping and a pure superconducting phase at high (both hole and electron) doping.
dc.description13 pages, 10 figures, revised version accepted by PRB
dc.identifierhttps://arxiv.org/abs/cond-mat/0511460
dc.identifierhttp://arxiv.org/abs/cond-mat/0511460
dc.identifierPhys. Rev. B 74, 024508 (2006)
dc.identifierdoi:10.1103/PhysRevB.74.024508
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/104286
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleAntiferromagnetic to superconducting phase transition in the hole- and electron-doped Hubbard model at zero temperature
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