First order Mott transition at zero temperature in two dimensions: Variational plaquette study

Abstract

The nature of the metal-insulator Mott transition at zero temperature has been discussed for a number of years. Whether it occurs through a quantum critical point or through a first order transition is expected to profoundly influence the nature of the finite temperature phase diagram. In this paper, we study the zero temperature Mott transition in the two-dimensional Hubbard model on the square lattice with the variational cluster approximation. This takes into account the influence of antiferromagnetic short-range correlations. By contrast to single-site dynamical mean-field theory, the transition turns out to be first order even at zero temperature.

6 pages, 5 figures, version 2 with additional results for 8 bath sites

References in corpus (7)

• Variational cluster approach to correlated electron systems in low dimensions
• Self-energy-functional approach: Analytical results and the Mott-Hubbard transition
• Sum-rules and bath-parametrization for quantum cluster theories
• Local Order and the gapped phase of the Hubbard model: a plaquette dynamical mean field investigation
• Pseudogap and Mott Transition Studied by Cellular Dynamical Mean Field Theory
• Magnetism and d-wave superconductivity on the half-filled square lattice with frustration
• Mott transition in one dimension: Benchmarking dynamical cluster approaches

Cited by in corpus (1)

• Low energy theory of the t-t'-t''-U Hubbard Model at half-filling: interaction strengths in cuprate superconductors and an effective spin-only description of La_2CuO_4