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Title: Orbital differentiation in Hund metals

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 $t$ 2g 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.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [2];  [3];  [1]
  1. Ludwig Maximilian Univ., Munich (Germany)
  2. Ludwig Maximilian Univ., Munich (Germany); Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States); Rutgers Univ., Piscataway, NJ (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1573473
Alternate Identifier(s):
OSTI ID: 1566932
Report Number(s):
BNL-212287-2019-JAAM
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:  
SC0012704
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 100; Journal Issue: 11; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Kugler, Fabian B., Lee, Seung-Sup B., Weichselbaum, Andreas, Kotliar, Gabriel, and von Delft, Jan. Orbital differentiation in Hund metals. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.100.115159.
Kugler, Fabian B., Lee, Seung-Sup B., Weichselbaum, Andreas, Kotliar, Gabriel, & von Delft, Jan. Orbital differentiation in Hund metals. United States. doi:10.1103/PhysRevB.100.115159.
Kugler, Fabian B., Lee, Seung-Sup B., Weichselbaum, Andreas, Kotliar, Gabriel, and von Delft, Jan. Fri . "Orbital differentiation in Hund metals". United States. doi:10.1103/PhysRevB.100.115159.
@article{osti_1573473,
title = {Orbital differentiation in Hund metals},
author = {Kugler, Fabian B. and Lee, Seung-Sup B. and Weichselbaum, Andreas and Kotliar, Gabriel and von Delft, Jan},
abstractNote = {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$2g 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.},
doi = {10.1103/PhysRevB.100.115159},
journal = {Physical Review B},
number = 11,
volume = 100,
place = {United States},
year = {2019},
month = {9}
}

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