Intershell interactions in correlated materials: A slave-rotor approach

Jakob Steinbauer and Silke Biermann
Phys. Rev. B 103, 195109 – Published 6 May 2021

Abstract

The treatment of intershell interactions remains a major challenge in the theoretical description of strongly correlated materials. Most previous approaches considered the influence of intershell interactions at best in a static fashion, neglecting dynamic effects. In this paper, we propose a slave-rotor method that goes beyond this approximation by incorporating the effect of intershell interactions in a dynamic manner. Our method is derived and implemented as a quantum impurity solver in the context of dynamical mean field theory and benchmarked on a two-orbital model system. The results from our slave-rotor technique are found to be in good agreement with our reference calculations that include intershell interactions explicitly. We identify and analyze qualitative features emerging from the dynamic treatment. Our results thus provide qualitative new insights, revealing the ambivalent effect of intershell interactions in strongly correlated materials.

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  • Received 6 December 2020
  • Accepted 23 March 2021

DOI:https://doi.org/10.1103/PhysRevB.103.195109

©2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Jakob Steinbauer1,* and Silke Biermann1,2,3,4

  • 1CPHT, CNRS, Ecole Polytechnique, Institut Polytechnique de Paris, F-91128 Palaiseau, France
  • 2Collège de France, 11 Place Marcelin Berthelot, 75005 Paris, France
  • 3Department of Physics, Division of Mathematical Physics, Lund University, Professorsgatan 1, 22363 Lund, Sweden
  • 4European Theoretical Spectroscopy Facility, Europe

  • *jakob.steinbauer@polytechnique.edu

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Issue

Vol. 103, Iss. 19 — 15 May 2021

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