Decoupling methods for the solution of the dynamical mean field theory impurity problem

ORAL

Abstract

The use of equation of motion decoupling methods as impurity solvers to be used in conjunction with the dynamical mean field self-consistency condition for the solution of lattice models is explored. By comparing the impurity solver to exact diagonalization results and applying it to lattice models like Hubbard model and Periodic Anderson model it is shown that the method could be a cheap alternative to computationally demanding methods like quantum Monte Carlo. The method works in a large range of parameters and promises to be useful in combination with density functional theory for the study of strongly correlated materials.

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Authors

  • Harald Jeschke

    Department of Physics, Johann Wolfgang, Institut f\"ur Theoretische Physik, Universit\"at Frankfurt, Robert-Mayer-Str. 8-10, 60054 Frankfurt, Germany

  • Gabriel Kotliar

    Rutgers University, Center for Materials Theory, Department of Physics and Astronomy, Rutgers University, Department of Physics, Rutgers University, Piscataway NJ USA, Department of Physics and Astronomy, Rutgers University, 136 Frelinghuysen Road, Piscataway, NJ 08854-8019, USA, Center for Materials Theory, Serin Physics Laboratory, Rutgers University, 136 Frelinghuysen Road, Piscataway, New Jersey 08854, Physics Department and Center for Materials, Rutgers University, Piscataway NJ USA