Dynamical response and competing orders in two-band Hubbard model

• URL: http://arxiv.org/abs/2006.09058v1
• Date: Tue, 16 Jun 2020 10:30:42 GMT
• Title: Dynamical response and competing orders in two-band Hubbard model
• Authors: A. Niyazi, D. Geffroy and J. Kune\v{s}
• Abstract summary: We study two-particle dynamical response functions in two-band Hubbard model. We observe the transition between theexcitonic condensate and spin-state ordered state is continuous with a narrow strip of supersolidphase separating the two.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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.

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