Volume 85, Number 1, January 2009
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||07 January 2009|
First-order Mott transition at zero temperature in two dimensions: Variational plaquette study
Institut für Theoretische Physik und Astrophysik, Universität Würzburg - Würzburg, Germany, EU
2 Département de physique and RQMP, Université de Sherbrooke - Québec, J1K 2R1 Canada
3 I. Institut für Theoretische Physik, Universität Hamburg - Hamburg, Germany, EU
Corresponding author: email@example.com
Accepted: 27 November 2008
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.
PACS: 71.10.-w – Theories and models of many-electron systems / 71.30.+h – Metal-insulator transitions and other electronic transitions
© EPLA, 2009
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