<div class="csl-bib-body">
<div class="csl-entry">Geffroy, D., Kaufmann, J., Hariki, A., Gunacker, P., Hausoel, A., & Kuneš, J. (2019). Collective Modes in Excitonic Magnets: Dynamical Mean-Field Study. <i>Physical Review Letters</i>, <i>122</i>(12), Article 127601. https://doi.org/10.1103/PhysRevLett.122.127601</div>
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dc.identifier.issn
0031-9007
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/148138
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dc.description.abstract
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.
en
dc.language.iso
en
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dc.publisher
AMER PHYSICAL SOC
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dc.relation.ispartof
Physical Review Letters
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dc.subject
exciton condensation
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dc.subject
DMFT
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dc.title
Collective Modes in Excitonic Magnets: Dynamical Mean-Field Study