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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
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Designer Spatial Control of Interactions in Ultracold Gases.

N Arunkumar1, A Jagannathan1,2, J E Thomas1

  • 1Department of Physics, North Carolina State University, Raleigh, North Carolina 27695, USA.

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|February 16, 2019
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We demonstrate precise optical control over interactions in ultracold atomic gases using electromagnetically induced transparency. This method allows for wide tunability and spatial manipulation of quantum interactions in lithium-6 fermions.

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Area of Science:

  • Quantum physics
  • Ultracold atomic gases
  • Quantum simulation

Background:

  • Designer optical control of interactions in ultracold atomic gases is crucial for quantum phases and black hole physics.
  • Existing methods like magnetic control offer limited spatial tunability.

Purpose of the Study:

  • To demonstrate wide tunability and spatial control of interactions in ultracold atomic gases using electromagnetically induced transparency.
  • To explore optical manipulation of quantum interactions in lithium-6 fermions.

Main Methods:

  • Utilized electromagnetically induced transparency with two control fields detuned from atomic resonance.
  • Employed megahertz frequency changes in optical beams to tune scattering length.
  • Imprinted and manipulated 1D "sandwich" structures of interacting regions.

Main Results:

  • Achieved wide tunability of scattering length, comparable to magnetic control, with negligible effect on the optical potential.
  • Demonstrated spatial control by creating and manipulating 1D interacting regions.
  • Observed excellent agreement between experimental data and a continuum-dressed state theoretical model.

Conclusions:

  • Electromagnetically induced transparency provides a powerful tool for designer optical control of ultracold atomic gas interactions.
  • This technique enables precise spatial and tunable control, advancing quantum simulation and fundamental physics research.