• Rapid Communication

Bardasis-Schrieffer polaritons in excitonic insulators

Zhiyuan Sun and Andrew J. Millis
Phys. Rev. B 102, 041110(R) – Published 8 July 2020
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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.

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  • Received 27 March 2020
  • Revised 19 June 2020
  • Accepted 19 June 2020

DOI:https://doi.org/10.1103/PhysRevB.102.041110

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Zhiyuan Sun1 and Andrew J. Millis1,2

  • 1Department of Physics, Columbia University, 538 West 120th Street, New York, New York 10027, USA
  • 2Center for Computational Quantum Physics, The Flatiron Institute, 162 5th Avenue, New York, New York 10010, USA

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Issue

Vol. 102, Iss. 4 — 15 July 2020

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