Journal article

Double-expansion impurity solver for multiorbital models with dynamically screened $U$ and $J$

  • Steiner, Karim Department of Physics, University of Fribourg, Switzerland
  • Nomura, Yusuke Centre de Physique Théorique (CPHT), École Polytechnique, Palaiseau, France
  • Werner, Philipp Department of Physics, University of Fribourg, Switzerland
    10.09.2015
Published in:
  • Physical Review B. - 2015, vol. 92, no. 11, p. 115123
English We present a continuous-time Monte Carlo impurity solver for multiorbital impurity models which combines a strong-coupling hybridization expansion and a weak-coupling expansion in the Hund's coupling parameter J. This double-expansion approach allows to treat the dominant density-density interactions U within the efficient segment representation. We test the approach for a two-orbital model with static interactions, and then explain how the double expansion allows to simulate models with frequency dependent U(ω) and J(ω). The method is used to investigate spin-state transitions in a toy model for fullerides, with repulsive bare J but attractive screened J.
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
  • English
Classification
Physics
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/304671
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