• Open Access

Probing open- and closed-channel p-wave resonances

Denise J. M. Ahmed-Braun, Kenneth G. Jackson, Scott Smale, Colin J. Dale, Ben A. Olsen, Servaas J. J. M. F. Kokkelmans, Paul S. Julienne, and Joseph H. Thywissen
Phys. Rev. Research 3, 033269 – Published 20 September 2021

Abstract

We study the near-threshold molecular and collisional physics of a strong K40 p-wave Feshbach resonance through a combination of measurements, numerical calculations, and modeling. Dimer spectroscopy employs both radio-frequency spin-flip association in the MHz band and resonant association in the kHz band. Systematic uncertainty in the measured binding energy is reduced by a model that includes both the Franck-Condon overlap amplitude and inhomogeneous broadening. Coupled-channels calculations based on mass-scaled K39 potentials compare well to the observed binding energies and also reveal a low-energy p-wave shape resonance in the open channel. Contrary to conventional expectation, we observe a nonlinear variation of the binding energy with magnetic field, and explain how this arises from the interplay of the closed-channel ramping state with the near-threshold shape resonance in the open channel. We develop an analytic two-channel model that includes both resonances as well as the dipole-dipole interactions which, we show, become important at low energy. Using this parametrization of the energy dependence of the scattering phase, we can classify the studied K40 resonance as broad. Throughout the paper, we compare to the well-understood s-wave case and discuss the significant role played by van der Waals physics. The resulting understanding of the dimer physics of p-wave resonances provides a solid foundation for future exploration of few- and many-body orbital physics.

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  • Received 9 January 2021
  • Accepted 18 August 2021

DOI:https://doi.org/10.1103/PhysRevResearch.3.033269

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & OpticalGeneral Physics

Authors & Affiliations

Denise J. M. Ahmed-Braun1, Kenneth G. Jackson2, Scott Smale2, Colin J. Dale2, Ben A. Olsen3, Servaas J. J. M. F. Kokkelmans1, Paul S. Julienne4, and Joseph H. Thywissen2

  • 1Department of Applied Physics, Eindhoven University of Technology, Eindhoven, The Netherlands
  • 2Department of Physics, University of Toronto, Toronto, Ontario M5S 1A7, Canada
  • 3Yale-NUS College, Singapore 138527, Singapore
  • 4Joint Quantum Institute, NIST / University of Maryland, College Park, Maryland 20742, USA

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Vol. 3, Iss. 3 — September - November 2021

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