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

Karim Steiner, Yusuke Nomura, Philipp Werner

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number115123
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume92
Issue number11
DOIs
Publication statusPublished - 2015 Sep 10
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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