title: Interaction-induced collapse of a section of the Fermi sea in the zigzag Hubbard ladder.
abstract: Using the next-nearest-neighbor (zigzag) Hubbard chain as a one-dimensional model, we investigate the influence of interactions on the position of the Fermi wave vectors with the density-matrix renormalization-group technique. For suitable choices of the hopping parameters we observe that electron-electron correlations induce very different renormalizations for the two different Fermi wave vectors, which ultimately lead to a complete destruction of one section of the Fermi sea in a quantum critical point.
authors.affiliation: Institut für Physik, Universität Dortmund, 44221 Dortmund, Germany.
authors.forename: Kay
authors.initials: K
authors.lastname: Hamacher
authors.forename: Claudius
authors.initials: C
authors.lastname: Gros
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Wenzel