Bardasis-Schrieffer polaritons in excitonic insulators

Abstract

Bardasis-Schrieffer modes in superconductors are fluctuations in subdominant pairing channels, e.g., d-wave fluctuations in an s-wave superconductor. This Rapid Communication shows that these modes also generically occur in excitonic insulators. In s-wave excitonic insulators, a p-wave Bardasis-Schrieffer mode exists below the gap energy, is optically active and hybridizes strongly with photons to form Bardasis-Schrieffer polaritons, which are observable in both far-field and near-field optical experiments.

arXiv comment5 pages, 4 figures

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Cited by in corpus (17)

• Phononic soft mode and strong electronic background behavior across the structural phase transition in the excitonic insulator Ta${}_2$NiSe${}_5$ (with Erratum)
• Bulk Photovoltaic Effect Driven by Collective Excitations in a Correlated Insulator
• Second order Josephson effect in excitonic insulators
• A New Era of Excitonic Insulators
• Nonlinear spectroscopy of collective modes in excitonic insulator
• Unveiling the underlying interactions in Ta2NiSe5 from photo-induced lifetime change
• Polaron spectroscopy of a bilayer excitonic insulator
• Topological charge pumping in excitonic insulators
• Graphene as a source of entangled plasmons
• Theory of time-crystalline behaviour mediated by phonon squeezing in Ta2NiSe5
• Floquet engineering of many-body states by the ponderomotive potential
• Higgs modes in two-dimensional spatially-indirect exciton condensates
• Collective modes in superconductors including Coulomb repulsion
• Superluminal Propagation of Composite Collective Modes in Superconductor-Ferromagnet Heterostructures
• Topological hybrid electron-hole Cooper pairing
• Collective terahertz fluctuation modes in a polariton laser
• Ab initio Approach to Collective Excitations in Excitonic Insulators