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 $8\times 2$ cluster and down to our lowest temperatures the transition from one to two dimensions is continuous.

5 pages, 8 figures, extended by data on the 4x4 cluster

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• Ground state phase diagram of the 2d Bose-Hubbard model with anisotropic hopping
• Mott Quantum Criticality in the Anisotropic 2D Hubbard Model
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• Pseudogap to metal transition in the anisotropic two-dimensional Hubbard model
• Equivalence of Rashba-Hubbard and Hubbard chains
• Multi-orbital physics in lithium-molybdenum purple-bronze: going beyond paradigm
• Local moments versus itinerant antiferromagnetism: magnetic phase diagram and spectral properties of the anisotropic square lattice Hubbard model
• Anisotropy crossover in the frustrated Hubbard model on four-chain cylinders
• A New Quasi One-Dimensional Compound Ba3TiTe5 and Superconductivity Induced by Pressure