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Your search keyword '"Pfeiffer, L. N."' showing total 12 results
Start Over Author "Pfeiffer, L. N." Journal nature communications
12 results on '"Pfeiffer, L. N."'

12. Directional Goldstone waves in polariton condensates close to equilibrium

Author

Marzena H. Szymańska, Lorenzo Dominici, Davide Caputo, R. T. Juggins, Ken W. West, Giuseppe Gigli, Daniele Sanvitto, Galbadrakh Dagvadorj, Milena De Giorgi, Dario Ballarini, Loren Pfeiffer, Ballarini, D., Caputo, D., Dagvadorj, G., Juggins, R., Giorgi, M. D., Dominici, L., West, K., Pfeiffer, L. N., Gigli, G., Szymanska, M. H., and Sanvitto, D.

Subjects
Quantum fluid, Quantum fluids and solids, Science, Polaritons, FOS: Physical sciences, Physics::Optics, General Physics and Astronomy, 02 engineering and technology, 01 natural sciences, Measure (mathematics), Article, General Biochemistry, Genetics and Molecular Biology, Superfluidity, 0103 physical sciences, Polariton, 14. Life underwater, lcsh:Science, 010306 general physics, Dispersion (water waves), Condensed Matter::Quantum Gases, Physics, Multidisciplinary, Condensed Matter::Other, General Chemistry, Dissipation, 021001 nanoscience & nanotechnology, Quantum Gases (cond-mat.quant-gas), 13. Climate action, Quantum electrodynamics, Quasiparticle, lcsh:Q, Condensed Matter - Quantum Gases, 0210 nano-technology, Excitation, Physics - Optics, Optics (physics.optics)
Abstract

Quantum fluids of light are realized in semiconductor microcavities using 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 reveal the effect of an asymmetric pumping by showing that collective excitations are created with a definite direction with respect to the condensate. Furthermore, we measure the critical sound speed for polariton superfluids close to equilibrium., Polariton condensates undergo continuous driving and dissipation, posing challenges for investigating their collective behaviour. Ballarini et al. adapt an oceanographic technique to measure the asymmetric occupation of the Goldstone mode and identify similarities with equilibrium condensates.

Published
2020
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