Excitonic Instability at the Spin-State Transition in the Two-Band Hubbard Model

Abstract

Using linear response theory with the dynamical mean-field approximation we investigate the particle-hole instabilities of the two-band Hubbard model in the vicinity of the spin-state transition. Besides the previously reported high-spin--low-spin order we find an instability towards triplet excitonic condensate. We discuss the strong and weak coupling limits of the model, in particular, a connection to the spinful hard-core bosons with a nearest-neighbor interaction. Possible realization in LaCoO3 at intermediate temperatures is briefly discussed.

9 pages, 6 figures, revised extended version

References in corpus (11)

• Continuous-time Monte Carlo methods for quantum impurity models
• Strong electronic correlations from Hund's coupling
• Magnetism and Charge Dynamics in Iron Pnictides
• High-spin to low-spin and orbital polarization transitions in multiorbital Mott systems
• Magnetic Moment Collapse-Driven Mott Transition in MnO
• Spin state transition and covalent bonding in LaCoO3
• Disproportionation and Metallization at Low-Spin to High-Spin Transition in Multiorbital Mott Systems
• Pressure-Driven Metal-Insulator Transition in Hematite from Dynamical Mean-Field Theory
• Spin-state Crossover Model for the Magnetism of Iron Pnictides
• Phase diagram of anisotropic boson t-J model
• Improved Green's Function Measurement for Hybridization Expansion Quantum Monte Carlo

Cited by in corpus (54)

• Nickelate superconductors $--$ Multiorbital nature and spin freezing
• Excitonic condensation in systems of strongly correlated electrons
• Electronic orders in multi-orbital Hubbard models with lifted orbital degeneracy
• Spin-Triplet Excitonic Insulator: The Case of Graphone
• Spin state ordering of strongly correlating LaCoO${}_3$ induced at ultrahigh magnetic fields
• Phase diagram and collective excitation in excitonic insulator: from the orbital physics viewpoint
• Excitonic condensation of strongly correlated electrons: the case of Pr${}_{0.5}$Ca${}_{0.5}$CoO${}_3$
• Exciton-phonon cooperative mechanism of the triple-$q$ charge-density-wave and antiferroelectric electron polarization in TiSe${}_2$
• Field-induced exciton condensation in LaCoO3
• Roles of Hund's rule coupling in excitonic density-wave states
• Collective Modes in Excitonic Magnets: Dynamical Mean-Field Study
• Competition between excitonic charge and spin density waves: Influence of electron-phonon and Hund's rule couplings
• Magnetic field effects in a correlated electron system with spin-state degree of freedom - Implication of an excitonic insulator -
• Phase diagram of exciton condensate in doped two-band Hubbard model
• Odd-Parity Multipoles by Staggered Magnetic Dipole and Electric Quadrupole Orderings in CeCoSi
• Signature of spin-triplet exciton condensations in LaCoO${}_3$ at ultrahigh magnetic fields up to 600 T
• Long-range orders, spin- and orbital-freezing in the two-band Hubbard model
• A New Era of Excitonic Insulators
• LDA+DMFT approach to ordering phenomena and the structural stability of correlated materials
• Electric and magnetic multipoles and bond orders in excitonic insulators
• Superfluidity and Density Order in a Bilayer Extended Hubbard Model
• Excitonic magnetism in $d^6$ perovskites
• Photoinduced electron-electron pairing in the extended Falicov-Kimball model
• Spin Seebeck Effect in Nonmagnetic Excitonic Insulators
• Switching between Mott-Hubbard and Hund physics in moiré quantum simulators
• Nonthermal excitonic condensation near a spin-state transition
• Spontaneous Spin Textures in Multiorbital Mott Systems
• Excitonic Insulator State of the Extended Falicov-Kimball Model in the Cluster Dynamical Impurity Approximation
• Dynamical response and competing orders in two-band Hubbard model
• Competing phases in a model of Pr-based cobaltites
• Excitonic magnet in external field: complex order parameter and spin currents
• Sign-Free Determinant Quantum Monte Carlo Study of Excitonic Density Orders in a Two-Orbital Hubbard-Kanamori Model
• Spin texture and spin current in excitonic phases of the two-band Hubbard model
• A review on magnetic field induced spin crossover in LaCoO${}_3$ up to 600 T
• Mott-Enhanced Exciton Condensation in a Hubbard bilayer
• Magnetism in spin crossover systems: short-range order and effects beyond the Heisenberg model
• Quantum paramagnet near spin-state transition
• Optical Response in Excitonic Insulating State: Variational Cluster Approach
• Excitonic Correlations, Spin-State Ordering, and Magnetic-Field Effects in One-Dimensional Two-Orbital Hubbard Model for Spin-Crossover Region
• Pressure-induced spin-state ordering in Sr${}_2$CoO${}_3$F
• Excitonic ordering in strongly correlated spin crossover systems: induced magnetism and excitonic excitation spectrum
• Strong enhancement of magnetic susceptibility induced by spin-nematic fluctuations in an excitonic insulating system with spin-orbit coupling
• Emergence of pure spin current in doped excitonic magnets
• Spin loop-current textures in Hubbard models
• Effects of magnetic fields and orbital angular momentum on excitonic condensation in two-orbital Hubbard model
• Classical Benchmarks for Variational Quantum Eigensolver Simulations of the Hubbard Model
• Photo-induced Dynamics of Quasicrystalline Excitonic Insulator
• Itinerant ferromagnetism in an SU(3) Fermi-Hubbard model at finite temperatures: A dynamical mean-field theory study
• Magnetic-field effect on excitonic condensation emergent in extended Falicov-Kimball model
• Symmetry breaking states in the half-filled two-orbital Hubbard model with crystalline electric field
• Strong-coupling formula for momentum-dependent susceptibilities in dynamical mean-field theory
• Strong effects of thermally induced low-spin-to-high-spin crossover on transport properties of correlated metals
• Magneto-Electric Effect in a Spin-State Transition System
• Photoinduced excitonic magnetism in a multiorbital Hubbard system