Collective Modes in Excitonic Magnets: Dynamical Mean-Field Study

Collective Modes in Excitonic Magnets: Dynamical Mean-Field Study

We present a dynamical mean-field study of dynamical susceptibilities in the 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 dynamical mean-field theory spectra in th...

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Veröffentlicht in:Physical review letters 2019-03, Vol.122 (12), p.127601-127601, Article 127601
Hauptverfasser: Geffroy, D, Kaufmann, J, Hariki, A, Gunacker, P, Hausoel, A, Kuneš, J
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Field study
Magnets
Mean field theory
Phase transitions
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container_issue 12
container_start_page 127601
container_title Physical review letters
container_volume 122
creator Geffroy, D
Kaufmann, J
Hariki, A
Gunacker, P
Hausoel, A
Kuneš, J
description We present a dynamical mean-field study of dynamical susceptibilities in the 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 dynamical mean-field theory spectra in the ordered phase reveal the gapless Goldstone modes arising from spontaneous breaking of continuous symmetries. We also observe the 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.
doi_str_mv 10.1103/PhysRevLett.122.127601
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subjects Field study
Magnets
Mean field theory
Phase transitions
title Collective Modes in Excitonic Magnets: Dynamical Mean-Field Study
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