Microscopic approach to high-temperature superconductors: Pseudogap phase
| dc.creator | Sykora, S. | |
| dc.creator | Becker, K. W. | |
| dc.date | 2009-03-05 | |
| dc.date.accessioned | 2026-07-07T12:49:15Z | |
| dc.date.available | 2026-07-07T12:49:15Z | |
| dc.description | Despite the intense theoretical and experimental effort, an understanding of the superconducting pairing mechanism of the high-temperature superconductors is still lacking. An additional puzzle is the unknown connection between the superconducting gap and the so-called pseudogap which is a central property of the most unusual normal state. Angle-resolved photoemission spectroscopy (ARPES) measurements have revealed a gap-like behavior on parts of the Fermi surface, leaving a non-gapped segment known as Fermi arc around the diagonal of the Brillouin zone. Starting from the $t$-$J$ model, in this paper we present a microscopic approach to investigate physical properties of the pseudogap phase in the framework of a novel renormalization scheme called PRM. This approach is based on a stepwise elimination of high-energy transitions using unitary transformations. We arrive at a renormalized 'free' Hamiltonian for correlated electrons. The ARPES spectral function along the Fermi surface turns out to be in good agreement with experiment: We find well-defined excitation peaks around $ω=0$ near the nodal direction, which become strongly suppressed around the antinodal point. The origin of the pseudogap can be traced back to a suppression of spectral weight from incoherent excitations in a small $ω$-range around the Fermi energy. In a subsequent paper, also the supercunducting phase at moderate hole doping will be discussed within the PRM approach. | |
| dc.description | 45 pages, 9 figures | |
| dc.identifier | https://arxiv.org/abs/0903.0921 | |
| dc.identifier | http://arxiv.org/abs/0903.0921 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/222339 | |
| dc.subject | Superconductivity | |
| dc.subject | Strongly Correlated Electrons | |
| dc.title | Microscopic approach to high-temperature superconductors: Pseudogap phase | |
| dc.type | text |