Journal
PHYSICAL REVIEW B
Volume 97, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.97.121113
Keywords
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Funding
- Argentine ANPCyT [PICT 2012-1069, PICT 2016-0402]
- PIP (CONICET)
- DOE BES [DE-FG02-99ER45761]
- NSF [ACI-1548562]
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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 Delta = 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.
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