Orbital differentiation in Hund metals

Kugler, Fabian B.; Lee, Seung-Sup B.; Weichselbaum, Andreas; Kotliar, Gabriel; von Delft, Jan

doi:10.1103/PhysRevB.100.115159

Title: Orbital differentiation in Hund metals

Journal Article · 27 September 2019 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.100.115159 · OSTI ID:1573473

^[1]; Lee, Seung-Sup B. ^[1];

^[2]; Kotliar, Gabriel ^[3]; von Delft, Jan ^[1]

Ludwig Maximilian Univ., Munich (Germany)
Ludwig Maximilian Univ., Munich (Germany); Brookhaven National Lab. (BNL), Upton, NY (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States); Rutgers Univ., Piscataway, NJ (United States)

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 $$t$$_{2_g} 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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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: SC0012704

OSTI ID:: 1573473

Report Number(s):: BNL--212287-2019-JAAM

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 11 Vol. 100; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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