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- W3102912195 abstract "Quantum fluids of light are realized in semiconductor microcavities by exciton-polaritons, solid-state quasi-particles with a light mass and sizeable interactions. Here, we use the microscopic analogue of oceanographic techniques to measure the excitation spectrum of a thermalised polariton condensate. Increasing the fluid density, we demonstrate the transition from a free-particle parabolic dispersion to a linear, sound-like Goldstone mode characteristic of superfluids at equilibrium. Notably, we show that excitations are created with a definite direction with respect to the condensate, analogous to how a sea breeze develops surface waves aligned with the wind. These results reveal the effect of asymmetric pumping on the collective excitations of a condensate. Furthermore, we measure the critical sound speed for polariton superfluids close to equilibrium." @default.
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- W3102912195 date "2020-01-10" @default.
- W3102912195 modified "2023-10-13" @default.
- W3102912195 title "Directional Goldstone waves in polariton condensates close to equilibrium" @default.
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- W3102912195 doi "https://doi.org/10.1038/s41467-019-13733-x" @default.
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