Novel subbands in the doped two-orbital Kanamori-Hubbard model

Abstract

We calculate and resolve with unprecedented detail the local density of states (DOS) and momentum-dependent spectral functions at zero temperature of one of the key models for strongly correlated electron materials, the degenerate two-orbital Kanamori-Hubbard model, by means of a highly optimized Dynamical Mean Field Theory which uses the Density Matrix Renormalization Group as the impurity solver. When the system is hole doped, and in the presence of a finite interorbital Coulomb interaction we find the emergence of a novel holon-doublon in-gap subband which is split by the Hund's coupling. We also observe new interesting features in the DOS like the splitting of the lower Hubbard band into a coherent narrowly dispersing peak around the Fermi energy, and another subband which evolves with the chemical potential. We characterize the main transitions giving rise to each subband by calculating the response functions of specific projected operators and comparing with the energies in the atomic limit, obtaining excellent agreement. The detailed results for the spectral functions found in this work pave the way to study with great precision the microscopic quantum behavior in correlated materials.

arXiv commentReplaced with updated results

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Cited by in corpus (6)

• In-gap band in the one-dimensional two-orbital Kanamori-Hubbard model with inter-orbital Coulomb interaction
• Hund bands in spectra of multiorbital systems
• Precise ground state of multi-orbital Mott systems via the variational discrete action theory
• Low-energy interband Kondo bound states in orbital-selective Mott phases
• Unconventional correlated metallic behavior due to interorbital Coulomb interaction
• Quantitative determination of the orbital-selective Mott transition and quantum entanglement in the orbital-selective Mott phase