title: Dimensional-crossover-driven Mott transition in the frustrated Hubbard model.
abstract: We study the Mott transition in a frustrated Hubbard model with next-nearest neighbor hopping at half-filling. The interplay between interaction, dimensionality, and geometric frustration closes the one-dimensional Mott gap and gives rise to a metallic phase with Fermi surface pockets. We argue that they emerge as a consequence of remnant one-dimensional umklapp scattering at the momenta with vanishing interchain hopping matrix elements. In this pseudogap phase, enhanced d-wave pairing correlations are driven by antiferromagnetic fluctuations. Within the adopted cluster dynamical mean-field theory on the 8 × 2 cluster and down to our lowest temperatures, the transition from one to two dimensions is continuous.
authors.affiliation: Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Germany.
authors.forename: Marcin
authors.initials: M
authors.lastname: Raczkowski
authors.forename: Fakher F
authors.initials: FF
authors.lastname: Assaad