Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-12-30
Phys. Rev. Lett. 97, 076405 (2006)
Physics
Condensed Matter
Strongly Correlated Electrons
Published version
Scientific paper
10.1103/PhysRevLett.97.076405
We present a new continuous time solver for quantum impurity models such as those relevant to dynamical mean field theory. It is based on a stochastic sampling of a perturbation expansion in the impurity-bath hybridization parameter. Comparisons to quantum Monte Carlo and exact diagonalization calculations confirm the accuracy of the new approach, which allows very efficient simulations even at low temperatures and for strong interactions. As examples of the power of the method we present results for the temperature dependence of the kinetic energy and the free energy, enabling an accurate location of the temperature-driven metal-insulator transition.
Comanac Armin
Medici Luca de
Millis Andrew. J.
Troyer Matthias
Werner Philipp
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