Effects of electric fields on heteronuclear Feshbach resonances in ultracold L6i-R87b mixtures

Z. Li and K. W. Madison
Phys. Rev. A 79, 042711 – Published 23 April 2009

Abstract

The effects of combined external electric and magnetic fields on elastic collisions in ultracold Li-Rb mixtures are studied using recently obtained experimentally verified potentials. Our analysis provides both quantitative predictions for and a detailed physical interpretation of the phenomena arising from electric-field-induced interactions. It is shown that the electric field shifts the positions of intrinsic magnetic Feshbach resonances, generates copies of resonances previously restricted to a particular partial-wave collision to other partial-wave channels, and splits Feshbach resonances into multiple resonances for states of nonzero angular momenta. It was recently observed that the magnetic dipole-dipole interaction can also lift the degeneracy of a p-wave state splitting of the associated p-wave Feshbach resonance into two distinct resonances at different magnetic fields. Our work shows that the splitting of the resonances produced by an applied electric field is more than 1 order of magnitude larger. This phenomenon offers a complementary way to produce and tune an anisotropic interaction and to study its effect on the many-body physics of heteronuclear atomic gases.

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  • Received 14 February 2009

DOI:https://doi.org/10.1103/PhysRevA.79.042711

©2009 American Physical Society

Authors & Affiliations

Z. Li1 and K. W. Madison2

  • 1Department of Chemistry, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1
  • 2Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1

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Issue

Vol. 79, Iss. 4 — April 2009

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