Radio-Frequency Manipulation of Fano-Feshbach Resonances in an Ultracold Fermi Gas of ${}^{40}$K

Abstract

Experimental control of magnetic Fano-Feshbach resonances in ultracold ${}^{40}$K Fermi gases, using radio-frequency (RF) fields, is demonstrated. Spectroscopic measurements are made of three molecular levels within 50 MHz of the atomic continuum, along with their variation with magnetic field. Modifying the scattering properties by an RF field is shown by measuring the loss profile versus magnetic field. This work provides the high accuracy locations of ground molecular states near the s-wave Fano-Feshbach resonance, which can be used to study the crossover regime from a Bose-Einstein condensate to a Bardeen-Cooper-Schrieffer superfluid in presence of an RF field.

5 pages, 3 figures

References in corpus (8)

• Using photoemission spectroscopy to probe a strongly interacting Fermi gas
• Feshbach resonances in rubidium 87: Precision measurement and analysis
• Observation of pseudogap behavior in a strongly interacting Fermi gas
• Controlling a magnetic Feshbach resonance with laser light
• Photoassociation of a Bose-Einstein Condensate near a Feshbach Resonance
• Radio-frequency dressing of multiple Feshbach resonances
• Creation and manipulation of Feshbach resonances with radio-frequency radiation
• Combination of a magnetic Feshbach resonance and an optical bound-to-bound transition

Cited by in corpus (1)

• Dissociation of Feshbach molecules via spin-orbit coupling in ultracold Fermi gases