Dynamics of a vortex lattice in an expanding polariton quantum fluid
arXiv:2009.10534 · doi:10.1103/PhysRevLett.127.047401
Abstract
If a quantum fluid is driven with enough angular momentum, at equilibrium the ground state of the system is given by a lattice of quantised vortices whose density is prescribed by the quantization of circulation. We report on the first experimental study of the Feynman-Onsager relation in a non-equilibrium polariton fluid, free to expand and rotate. Upon initially imprinting a lattice of vortices in the quantum fluid, we track the vortex core positions on picosecond time scales. We observe an accelerated stretching of the lattice and an outward bending of the linear trajectories of the vortices, due to the repulsive polariton interactions. Access to the full density and phase fields allows us to detect a small deviation from the Feynman-Onsager rule in terms of a transverse velocity component, due to the density gradient of the fluid envelope acting on the vortex lattice.
arXiv commentMain 6 pages, 4 figures, SM 4 pages, 5 figures
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- Conformal-invariance of 2D quantum turbulence in an exciton-polariton fluid of light
- Driven-dissipative turbulence in exciton-polariton quantum fluids
- Discrete chiral ballistic polariton laser
- CNN-Based Vortex Detection in Atomic 2D Bose Gases in the Presence of a Phononic Background
- Stability of vortices in exciton-polariton condensates with spin-orbital-angular-momentum coupling