High-Resolution Coherent Probe Spectroscopy of a Polariton Quantum Fluid

F. Claude, M. J. Jacquet, R. Usciati, I. Carusotto, E. Giacobino, A. Bramati, and Q. Glorieux
Phys. Rev. Lett. 129, 103601 – Published 29 August 2022

Abstract

Characterizing elementary excitations in quantum fluids is essential to study their collective effects. We present an original angle-resolved coherent probe spectroscopy technique to study the dispersion of these excitation modes in a fluid of polaritons under resonant pumping. Thanks to the unprecedented spectral and spatial resolution, we observe directly the low-energy phononic behavior and detect the negative-energy modes, i.e., the ghost branch, of the dispersion relation. In addition, we reveal narrow spectral features precursory of dynamical instabilities due to the intrinsic out-of-equilibrium nature of the system. This technique provides the missing tool for the quantitative study of quantum hydrodynamics in polariton fluids.

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  • Received 18 December 2021
  • Revised 29 April 2022
  • Accepted 8 August 2022

DOI:https://doi.org/10.1103/PhysRevLett.129.103601

© 2022 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
  1. Techniques
Atomic, Molecular & Optical

Authors & Affiliations

F. Claude1, M. J. Jacquet1, R. Usciati2, I. Carusotto2, E. Giacobino1, A. Bramati1, and Q. Glorieux1

  • 1Laboratoire Kastler Brossel, Sorbonne Université, ENS-Université PSL, Collège de France, CNRS, 4 place Jussieu, 75252 Paris Cedex 05, France
  • 2INO-CNR BEC Center and Dipartimento di Fisica, Università di Trento, via Sommarive 14, I-38123 Trento, Italy

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Issue

Vol. 129, Iss. 10 — 2 September 2022

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