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Area of Science:

  • Quantum optics
  • Bose-Einstein condensates
  • Nonlinear optics

Background:

  • Superfluids of light offer a unique platform for studying quantum phenomena analogous to those in condensed matter systems.
  • Binary mixtures of superfluids provide a richer system for exploring collective excitations and emergent behaviors.

Purpose of the Study:

  • To experimentally observe and characterize spin and density modes in a binary mixture of superfluids of light.
  • To investigate the excitation and dispersion relations of these collective modes.
  • To explore the influence of nonlinear interactions and saturation effects on the mode behavior.

Main Methods:

  • Creation of a miscible Bose-Bose mixture using two circular polarization components of a laser propagating through a nonlinear atomic vapor.
  • Selective excitation of fundamental modes by controlling laser intensity and phase.
  • Measurement of the dispersion relation using a Bragg-like spectroscopy technique.

Main Results:

  • Experimental observation of two distinct branches in the dispersion relation, corresponding to spin and density modes.
  • Measurement of different sound velocities for the spin and density modes.
  • Observation of a branch crossing at high photon densities, attributed to higher-order nonlinear terms and nonlinearity saturation.

Conclusions:

  • The study successfully demonstrates the existence and distinct nature of spin and density modes in superfluids of light.
  • The findings provide insights into the fundamental excitations and nonlinear dynamics of interacting light fields.
  • The observed phenomena open avenues for exploring novel quantum effects in nonlinear optical systems.