Collective Modes in Excitonic Magnets: Dynamical Mean-Field Study
D. Geffroy, J. Kaufmann, A. Hariki, P. Gunacker, A. Hausoel, and J., Kunes
TL;DR
This study uses dynamical mean-field theory to analyze collective excitations in excitonic magnets within a two-band Hubbard model, revealing Goldstone and Higgs modes and suggesting experimental probes for excitonic condensation.
Contribution
It provides a detailed DMFT analysis of two-particle excitations in excitonic magnets, highlighting the nature of collective modes across phase transitions.
Findings
Identification of gapless Goldstone modes in the ordered phase.
Observation of a gapped Higgs mode at the phase boundary.
Qualitative changes in spin susceptibility as experimental signatures.
Abstract
We present a dynamical mean-field study of dynamical susceptibilities in two-band Hubbard model. Varying the model parameters we analyze the two-particle excitations in the normal as well as in the ordered phase, an excitonic condensate. The two-particle DMFT spectra in the ordered phase reveal the gapless Goldstone modes arising from spontaneous breaking of continuous symmetries. We also observe gapped Higgs mode, characterized by vanishing of the gap at the phase boundary. Qualitative changes observed in the spin susceptibility can be used as an experimental probe to identify the excitonic condensation.
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