Collective Modes in Excitonic Magnets: Dynamical Mean-Field Study
Strongly Correlated Electrons
2019-04-01 v2 Statistical Mechanics
Computational Physics
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.
Cite
@article{arxiv.1808.08046,
title = {Collective Modes in Excitonic Magnets: Dynamical Mean-Field Study},
author = {D. Geffroy and J. Kaufmann and A. Hariki and P. Gunacker and A. Hausoel and J. Kunes},
journal= {arXiv preprint arXiv:1808.08046},
year = {2019}
}
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published version