High-Resolution Coherent Probe Spectroscopy of a Polariton Quantum Fluid

Year: 2022

Authors: Claude F., Jacquet MJ., Usciati R., Carusotto I., Giacobino E., Bramati A., Glorieux Q.

Autors Affiliation: Univ PSL, Sorbonne Univ, Coll France, CNRS,ENS,Lab Kastler Brossel, 4 Pl Jussieu, F-75252 Paris 05, France; Univ Trento, INO CNR BEC Ctr, Via Sommar 14, I-38123 Trento, Italy; Univ Trento, Dipartimento Fis, Via Sommar 14, I-38123 Trento, Italy.

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.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 129 (10)      Pages from: 103601-1  to: 103601-6

More Information: We acknowledge financial support from the H2020FETFLAG-2018-2020 project PhoQuS (n.820392). I. C. acknowledges financial support from the Provincia Autonoma di Trento and from the Q@TNinitiative.Q.G.andA.B.are members of the Institut Universitaire de France.
KeyWords: Bose-einstein Condensation; Instabilities; Superfluidity; Excitations; Turbulence; Helium
DOI: 10.1103/PhysRevLett.129.103601

Citations: 16
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