Higgs modes in two-dimensional spatially-indirect exciton condensates
Abstract
Higgs 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 modes, i.e., those that have a large weight in electron-hole pair amplitude response functions. We find that in the low exciton density (BEC) limit, the dominant Higgs 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.
Cite
@article{arxiv.2003.01185,
title = {Higgs modes in two-dimensional spatially-indirect exciton condensates},
author = {Fei Xue and Fengcheng Wu and Allan H. MacDonald},
journal= {arXiv preprint arXiv:2003.01185},
year = {2020}
}
Comments
12 pages, 5 figures. Comments are welcome