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Dipolar evaporation and resonant shielding of KRb molecules in quasi-2D

ORAL

Abstract

Quantum degenerate gases of polar molecules open new possibilities for engineering strongly-correlated quantum matter. However, tuning molecular interactions to create a system that is both long-lived and strongly dipolar has remained an outstanding experimental challenge. We have implemented two strategies for controlling interactions in a quasi-2D geometry [1-2]. First, by polarizing the molecular dipoles perpendicular to the 2D plane, we induce repulsive dipolar interactions, which provide elastic collisions while suppressing losses. We achieve a ratio of elastic to inelastic collision rates of ~200, and demonstrate direct evaporation to below the Fermi temperature. Second, we observe resonant shielding of losses, which arises from dipolar coupling between two pairs of rotational states made degenerate by the external electric field. At the optimal shielding, we suppress the loss rate by an order of magnitude below the background value. These results provide a starting point for future explorations of collective dipolar phenomena in 2D.

[1] G. Valtolina, K. Matsuda, W. G. Tobias, J.-R. Li, L. De Marco, and J. Ye, Nature 588, 239-243 (2020).

[2] K. Matsuda, L. De Marco, J.-R. Li, W. G. Tobias, G. Valtolina, G. Quéméner, and J. Ye, Science 370, 1324-1327 (2020).

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Publication: G. Valtolina, K. Matsuda, W. G. Tobias, J.-R. Li, L. De Marco, and J. Ye, Nature 588, 239-243 (2020).<br>K. Matsuda, L. De Marco, J.-R. Li, W. G. Tobias, G. Valtolina, G. Quéméner, and J. Ye, Science 370, 1324-1327 (2020).

Presenters

  • Kyle Y Matsuda

    JILA and University of Colorado Boulder, JILA, University of Colorado Boulder, University of Colorado, Boulder

Authors

  • Kyle Y Matsuda

    JILA and University of Colorado Boulder, JILA, University of Colorado Boulder, University of Colorado, Boulder

  • Jun-Ru Li

    JILA and University of Colorado Boulder, JILA, University of Colorado Boulder, JILA

  • William G Tobias

    JILA and University of Colorado Boulder, JILA, University of Colorado Boulder, University of Colorado, Boulder

  • Giacomo Valtolina

    JILA and University of Colorado Boulder, JILA, University of Colorado Boulder, University of Colorado, Boulder

  • Luigi de Marco

    JILA and University of Colorado Boulder, JILA, University of Colorado Boulder, JILA

  • Calder Miller

    JILA and University of Colorado Boulder, JILA, University of Colorado Boulder

  • Goulven Quéméner

    Université Paris-Saclay, CNRS, Laboratoire Aimé Cotton, Université Paris-Saclay, CNRS, Laboratoire Aimé Cotton, Orsay, France, CNRS

  • Jun Ye

    JILA and University of Colorado Boulder, JILA, University of Colorado, Boulder, University of Colorado, Boulder, JILA, NIST, and University of Colorado Boulder, JILA, University of Colorado Boulder, JILA, University of Colorado and National Institute of Standards and Technology, and Department of Physics, University of Colorado, Boulder, Colorado 80309, USA, JILA, National Institute of Standards and Technology and Department of Physics, University of Colorado, Boulder, Colorado 80309, USA, JILA, NIST, and Department of Physics, University of Colorado, Boulder, JILA, NIST, and University of Colorado, Boulder, JILA, NIST, and University of Colorado at Boulder