High-resolution coherent probe spectroscopy of a polariton quantum fluid
| Autor: | F. Claude, M. J. Jacquet, R. Usciati, I. Carusotto, E. Giacobino, A. Bramati, Q. Glorieux |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | arXiv |
| DOI: | 10.48550/arxiv.2112.09903 |
| Popis: | Characterising elementary excitations in quantum fluids is essential to study collective effects within. 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 behaviour and detect the negative-energy modes, i.e. the \textit{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. 5 pages, 2 figures. Comments are welcome |
| Databáze: | OpenAIRE |
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