Orbital differentiation in Hund metals

Fabian B. Kugler, Seung-Sup B. Lee, Andreas Weichselbaum, Gabriel Kotliar, and Jan von Delft
Phys. Rev. B 100, 115159 – Published 27 September 2019

Abstract

Orbital differentiation is a common theme in multiorbital systems, yet a complete understanding of it is still missing. Here, we consider a minimal model for orbital differentiation in Hund metals with a highly accurate method: We use the numerical renormalization group as a real-frequency impurity solver for a dynamical mean-field study of three-orbital Hubbard models, where a crystal field shifts one orbital in energy. The individual phases are characterized with dynamic correlation functions and their relation to diverse Kondo temperatures. Upon approaching the orbital-selective Mott transition, we find a strongly suppressed spin coherence scale and uncover the emergence of a singular Fermi liquid and interband doublon-holon excitations. Our theory describes the diverse polarization-driven phenomena in the t2g bands of materials such as ruthenates and iron-based superconductors, and our methodological advances pave the way toward real-frequency analyses of strongly correlated materials.

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  • Received 26 April 2019
  • Revised 30 August 2019

DOI:https://doi.org/10.1103/PhysRevB.100.115159

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Fabian B. Kugler1, Seung-Sup B. Lee1, Andreas Weichselbaum2,1, Gabriel Kotliar2,3, and Jan von Delft1

  • 1Arnold Sommerfeld Center for Theoretical Physics, Center for NanoScience, and Munich Center for Quantum Science and Technology, Ludwig-Maximilians-Universität München, 80333 Munich, Germany
  • 2Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
  • 3Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA

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Issue

Vol. 100, Iss. 11 — 15 September 2019

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