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Title: Emergent low-energy bound states in the two-orbital Hubbard model

Abstract

A repulsive Coulomb interaction between electrons in different orbitals in correlated materials can give rise to bound quasiparticle states. We study the nonhybridized two-orbital Hubbard model with intra- (inter)orbital interaction U (U 12) and different bandwidths using an improved dynamical mean-field theory numerical technique which leads to reliable spectra on the real energy axis directly at zero temperature. We find that a finite density of states at the Fermi energy in one band is correlated with the emergence of well-defined quasiparticle states at excited energies Δ = U - U 12 in the other band. These excitations are interband holon-doublon bound states. At the symmetric point U = U 12, the quasiparticle peaks are located at the Fermi energy, leading to a simultaneous and continuous Mott transition settling a long-standing controversy.

Authors:
 [1];  [2];  [1]
  1. Centro Atómico Bariloche and Inst. Balseiro, CNEA and CONICET, Bariloche (Argentina)
  2. Rutgers Univ., Piscataway, NJ (United States). Dept. of Physics and Astronomy; Brookhaven National Lab. (BNL), Upton, NY (United States).Condensed Matter Physics and Materials Science Dept.
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:
1457350
Alternate Identifier(s):
OSTI ID: 1430566
Report Number(s):
BNL-205799-2018-JAAM
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US1901363
Grant/Contract Number:  
SC0012704; FG02-99ER45761
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 97; Journal Issue: 12; 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

Nunez-Fernandez, Y., Kotliar, G., and Hallberg, K. Emergent low-energy bound states in the two-orbital Hubbard model. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.97.121113.
Nunez-Fernandez, Y., Kotliar, G., & Hallberg, K. Emergent low-energy bound states in the two-orbital Hubbard model. United States. doi:10.1103/PhysRevB.97.121113.
Nunez-Fernandez, Y., Kotliar, G., and Hallberg, K. Fri . "Emergent low-energy bound states in the two-orbital Hubbard model". United States. doi:10.1103/PhysRevB.97.121113. https://www.osti.gov/servlets/purl/1457350.
@article{osti_1457350,
title = {Emergent low-energy bound states in the two-orbital Hubbard model},
author = {Nunez-Fernandez, Y. and Kotliar, G. and Hallberg, K.},
abstractNote = {A repulsive Coulomb interaction between electrons in different orbitals in correlated materials can give rise to bound quasiparticle states. We study the nonhybridized two-orbital Hubbard model with intra- (inter)orbital interaction U (U12) and different bandwidths using an improved dynamical mean-field theory numerical technique which leads to reliable spectra on the real energy axis directly at zero temperature. We find that a finite density of states at the Fermi energy in one band is correlated with the emergence of well-defined quasiparticle states at excited energies Δ = U - U12 in the other band. These excitations are interband holon-doublon bound states. At the symmetric point U = U12, the quasiparticle peaks are located at the Fermi energy, leading to a simultaneous and continuous Mott transition settling a long-standing controversy.},
doi = {10.1103/PhysRevB.97.121113},
journal = {Physical Review B},
number = 12,
volume = 97,
place = {United States},
year = {2018},
month = {3}
}

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