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.

arXiv comment8 pages, 9 figures

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• Mott-Enhanced Exciton Condensation in a Hubbard bilayer
• Magnetism of competing high-spin/low-spin states in Ba${}_2$NiO${}_2$(AgSe)${}_2$ and related two-orbital two-electron systems
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• Antiferromagnetic magnons and local anisotropy: dynamical mean-field study