Dynamical response and competing orders in two-band Hubbard model

Abstract

We present a dynamical mean-field study of two-particle dynamical response functions in two-band Hubbard model across several phase transitions. We observe that the transition between theexcitonic condensate and spin-state ordered state is continuous with a narrow strip of supersolidphase separating the two. Approaching transition from the excitonic condensate is announced bysoftening of the excitonic mode at theMpoint of the Brillouin zone. Inside the spin-state orderedphase there is a magnetically ordered state with 2x2 periodicity, which has no precursor in thenormal phase.

8 pages, 9 figures

References in corpus (8)

• Evidence for an excitonic insulator phase in 1T-TiSe${}_2$
• High-spin to low-spin and orbital polarization transitions in multiorbital Mott systems
• Updated Core Libraries of the ALPS Project
• Disproportionation and Metallization at Low-Spin to High-Spin Transition in Multiorbital Mott Systems
• A cascade of magnetic field induced spin transitions in LaCoO3
• Conservation in two-particle self-consistent extensions of dynamical-mean-field-theory
• Phase diagram of exciton condensate in doped two-band Hubbard model
• Pressure-induced spin-state ordering in Sr${}_2$CoO${}_3$F