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Higgs-like modes in two-dimensional spatially indirect exciton condensates

TitleHiggs-like modes in two-dimensional spatially indirect exciton condensates
Publication TypeJournal Article
Year of Publication2020
AuthorsF. Xue, F. Wu, and A.. H. MacDonald
JournalPhys. Rev. B
Date PublishedAUG 25
Type of ArticleArticle

Higgs-like modes in condensed-matter physics have drawn attention because of analogies to the Higgs bosons of particle physics. Here we use a microscopic time-dependent mean-field theory to study the collective mode spectra of two-dimensional spatially indirect exciton (electron-hole pair) condensates, focusing on the Higgs-like modes, i.e., those that have a large weight in electron-hole pair amplitude response functions. We find that in the low exciton density (Bose-Einstein condensate) limit, the dominant Higgs-like modes of spatially indirect exciton condensates correspond to adding electron-hole pairs that are orthogonal to the condensed pair state. We comment on the previously studied Higgs-like collective excitations of superconductors in light of this finding.