Phase diagram of exciton condensate in doped two-band Hubbard model

Abstract

Using the dynamical mean-field approximation we investigate formation of excitonic condensate in the two-band Hubbard model in the vicinity of the spin-state transition. With temperature and band filling as the control parameters we realize all symmetry allowed spin-triplet excitonic phases, some exhibiting a ferromagnetic polarization. While the transitions are first-order at low temperatures, at elevated temperatures continuous transitions are found that give rise to a multi-critical point. Rapid but continuous transition between ferromagnetic and non-magnetic excitonic phases allows switching of uniform magnetization by small changes of chemical potential.

arXiv comment8 pages, 6 figures

References in corpus (20)

• Continuous-time Monte Carlo methods for quantum impurity models
• A continuous-time solver for quantum impurity models
• Bose-Einstein Condensation of Excitons in Bilayer Electron Systems
• Magnetism, superconductivity, and pairing symmetry in Fe-based superconductors
• Bose-Einstein Condensation in Magnetic Insulators
• Excitonic Magnetism in Van Vleck-type d^4 Mott Insulators
• High-spin to low-spin and orbital polarization transitions in multiorbital Mott systems
• A Generic Two-band Model for Unconventional Superconductivity and Spin-Density-Wave Order in Electron and Hole Doped Iron-Based Superconductors
• Disproportionation and Metallization at Low-Spin to High-Spin Transition in Multiorbital Mott Systems
• Magnetic properties and spin waves of bilayer magnets in a uniform field
• Ferromagnetism and superstructure in Ca_{1-x}La_xB_6
• Excitonic Instability at the Spin-State Transition in the Two-Band Hubbard Model
• Excitonic condensation of strongly correlated electrons: the case of Pr${}_{0.5}$Ca${}_{0.5}$CoO${}_3$
• Excitonic spin density wave state in iron pnictides
• Excitonic order at strong-coupling: pseudo-spins, doping, and ferromagnetism
• Spin-state transition and phase separation in multi-orbital Hubbard model
• Effect of intraband Coulomb repulsion on the excitonic spin-density wave
• Determinant quantum Monte Carlo study of exciton condensation in the bilayer Hubbard model
• Exciton condensation in strongly correlated electron bilayers
• Weak Ferromagnetism and Excitonic Condensates

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