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  • Letter
  • Open Access

Pairing of composite electrons and composite holes in νT=1 quantum Hall bilayers

Luca Rüegg*, Gaurav Chaudhary†, and Robert-Jan Slager

  • TCM Group, Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom

  • *lr537@cam.ac.uk
  • †gc674@cam.ac.uk
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Phys. Rev. Research 5, L042022 – Published 8 November, 2023

DOI: https://doi.org/10.1103/PhysRevResearch.5.L042022

Abstract

Motivated by recent experimental indications of preformed electron-hole pairs in νT=1 quantum Hall bilayers at relatively large separation, we formulate a Chern-Simons (CS) theory of the coupled composite electron liquid (CEL) and composite hole liquid (CHL). We show that the effective action of the CS gauge field fluctuations around the saddle point leads to stable pairing between CEL and CHL. We find that the CEL-CHL pairing theory leads to a dominant s-wave channel in contrast to the dominant p-wave channel found in the CEL-CEL pairing theory. Moreover, the CEL-CHL pairing is generally stronger than the CEL-CEL pairing across the whole frequency spectrum. Finally, we discuss possible differences between the two pairing mechanisms that may be probed in experiments.

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Phys. Rev. Research 5, L042022– Published 8 November, 2023
  • Received 24 March 2023
  • Accepted 5 October 2023
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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