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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
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Frictionless flow in a binary polariton superfluid.

E Cancellieri1, F M Marchetti, M H Szymańska

  • 1Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid, Madrid, Spain. emiliano.cancellieri@uam.es

Physical Review Letters
|March 10, 2012
PubMed
Summary
This summary is machine-generated.

We investigated a binary polariton superfluid, finding its frictionless flow depends on component coupling. Analyzing drag force on defects reveals how to experimentally observe the transition from supersonic to subsonic motion.

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Area of Science:

  • Quantum fluid dynamics
  • Solid-state physics
  • Optics

Background:

  • Microcavity polariton superfluids exhibit superfluid properties, including frictionless flow.
  • Understanding the transition between supersonic and subsonic regimes is crucial for controlling quantum fluid behavior.

Purpose of the Study:

  • To investigate the properties of a binary microcavity polariton superfluid.
  • To describe the crossover from supersonic to subsonic flow regimes.
  • To provide an experimental method for observing this transition.

Main Methods:

  • Coherent injection of a binary polariton superfluid using two lasers with different momenta and energies.
  • Evaluation of the system's linear response to a weak defect potential.
  • Analysis of the drag force exerted on the defect.

Main Results:

  • The coupling between the two superfluid components dictates their interaction with defects.
  • Both components either flow frictionlessly or scatter against the defect.
  • Scattering is minimal in weakly coupled systems.

Conclusions:

  • The study characterizes the supersonic to subsonic crossover in binary polariton superfluids.
  • Experimental observation of this crossover can be achieved by analyzing defect drag forces.
  • Findings offer insights into controlling quantum fluid dynamics.