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Observation of bound state self-interaction in a nano-eV atom collider

Author

Listed:
  • Ryan Thomas

    (University of Otago)

  • Matthew Chilcott

    (University of Otago)

  • Eite Tiesinga

    (National Institute of Standards and Technology and University of Maryland)

  • Amita B. Deb

    (University of Otago)

  • Niels Kjærgaard

    (University of Otago)

Abstract

Quantum mechanical scattering resonances for colliding particles occur when a continuum scattering state couples to a discrete bound state between them. The coupling also causes the bound state to interact with itself via the continuum and leads to a shift in the bound state energy, but, lacking knowledge of the bare bound state energy, measuring this self-energy via the resonance position has remained elusive. Here, we report on the direct observation of self-interaction by using a nano-eV atom collider to track the position of a magnetically-tunable Feshbach resonance through a parameter space spanned by energy and magnetic field. Our system of potassium and rubidium atoms displays a strongly non-monotonic resonance trajectory with an exceptionally large self-interaction energy arising from an interplay between the Feshbach bound state and a different, virtual bound state at a fixed energy near threshold.

Suggested Citation

  • Ryan Thomas & Matthew Chilcott & Eite Tiesinga & Amita B. Deb & Niels Kjærgaard, 2018. "Observation of bound state self-interaction in a nano-eV atom collider," Nature Communications, Nature, vol. 9(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-07375-8
    DOI: 10.1038/s41467-018-07375-8
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