Article Dans Une Revue Phys.Rev.Lett. Année : 2022

High-Resolution Coherent Probe Spectroscopy of a Polariton Quantum Fluid

Résumé

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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hal-03770234 , version 1 (17-10-2024)

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Ferdinand Claude, Maxime J. Jacquet, Romain Usciati, Iacopo Carusotto, Elisabeth Giacobino, et al.. High-Resolution Coherent Probe Spectroscopy of a Polariton Quantum Fluid. Phys.Rev.Lett., 2022, 129 (10), pp.103601. ⟨10.1103/PhysRevLett.129.103601⟩. ⟨hal-03770234⟩
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