Hund Physics Landscape of Two-Orbital Systems

Ryee, Siheon; Han, Myung Joon; Choi, Sangkook

doi:10.1103/physrevlett.126.206401

Hund Physics Landscape of Two-Orbital Systems

Journal Article · Mon May 17 00:00:00 EDT 2021 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.126.206401· OSTI ID:1798485

^[1]; Han, Myung Joon ^[1]; ^[2]

KAIST, Daejeon (Korea)
Brookhaven National Lab. (BNL), Upton, NY (United States)

Motivated by the recent discovery of superconductivity in infinite-layer nickelates RE_1–δSr_δNiO₂ (RE = Nd, Pr), we study the role of Hund coupling J in a quarter-filled two-orbital Hubbard model, which has been on the periphery of the attention. Here, a region of negative effective Coulomb interaction of this model is revealed to be differentiated from three- and five-orbital models in their typical Hund metal active fillings. We identify distinctive regimes including four different correlated metals, one of which stems from the proximity to a Mott insulator, while the other three, which we call “intermediate” metal, weak Hund metal, and valence-skipping metal, from the effect of J being away from Mottness. Defining criteria characterizing these metals is suggested, establishing the existence of Hund metallicity in two-orbital systems.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division

Grant/Contract Number:: AC02-05CH11231; SC0012704

OSTI ID:: 1798485

Report Number(s):: BNL--221685-2021-JAAM

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 20 Vol. 126; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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