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- W2893224882 abstract "Abstract Due to their driven-dissipative nature, photonic quantum fluids present new challenges in understanding superfluidity. Some associated effects have been observed, and notably the report of nearly dissipationless flow for coherently driven microcavity-polaritons was taken as a smoking gun for superflow. Here, we show that the superfluid response—the difference between responses to longitudinal and transverse forces—is zero for coherently driven polaritons. This is a consequence of the gapped excitation spectrum caused by external phase locking. Furthermore, while a normal component exists at finite pump momentum, the remainder forms a rigid state that is unresponsive to either longitudinal or transverse perturbations. Interestingly, the total response almost vanishes when the real part of the excitation spectrum has a linear dispersion, which was the regime investigated experimentally. This suggests that the observed suppression of scattering should be interpreted as a sign of this new rigid state and not a superfluid." @default.
- W2893224882 created "2018-10-05" @default.
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- W2893224882 date "2018-10-03" @default.
- W2893224882 modified "2023-10-02" @default.
- W2893224882 title "Coherently driven microcavity-polaritons and the question of superfluidity" @default.
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- W2893224882 doi "https://doi.org/10.1038/s41467-018-06436-2" @default.
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