An introduction to quantum cluster methods

Details An introduction to quantum cluster methods An introduction to quantum cluster methods

2008-06-17

arxiv.org/abs/0806.2690v2

Physics

Condensed Matter

Strongly Correlated Electrons

25 pages, 22 figures. Lectures given at the CIFAR - PITP International Summer School on Numerical Methods for Correlated Syste

Scientific paper

These lecture notes provide an introduction to quantum cluster methods for strongly correlated systems. Cluster Perturbation Theory (CPT), the Variational Cluster Approximation (VCA) and Cellular Dynamical Mean Field Theory (CDMFT) are described, as well as the exact diagonalization solver for the cluster. Potthoff's self-energy functional formalism is reviewed. Some numerical procedures, in particular regarding the exact diagonalization method and the frequency-momentum integrals needed in VCA, are discussed in detail.

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