Title | Higgs-like modes in two-dimensional spatially indirect exciton condensates |
Publication Type | Journal Article |
Year of Publication | 2020 |
Authors | F. Xue, F. Wu, and A.. H. MacDonald |
Journal | Phys. Rev. B |
Volume | 102 |
Pagination | 075136 |
Date Published | AUG 25 |
Type of Article | Article |
ISSN | 2469-9950 |
Abstract | 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. |
DOI | 10.1103/PhysRevB.102.075136 |