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:
-
[1];
[2];
- 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)
- Publication Date:
- Research Org.:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1573473
- Alternate Identifier(s):
- OSTI ID: 1566932
- Report Number(s):
- BNL-212287-2019-JAAM
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US2100050
- 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. https://doi.org/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. https://doi.org/10.1103/PhysRevB.100.115159. https://www.osti.gov/servlets/purl/1573473.
@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 = {Fri Sep 27 00:00:00 EDT 2019},
month = {Fri Sep 27 00:00:00 EDT 2019}
}
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