Repeated output coupling of ultracold Feshbach molecules from a Cs BEC

Abstract

We investigate magnetoassociation of ultracold Feshbach molecules from a Bose- Einstein condensate of Cs atoms and explore the spectrum of weakly bound molecular states close to the atomic threshold. By exploiting the variation of magnetic field experienced by a molecular cloud falling in the presence of a magnetic field gradient, we demonstrate the repeated output coupling of molecules from a single atomic cloud using a Feshbach resonance at 19.89 G. Using this method we are able to produce up to 24 separate pulses of molecules from a single atomic condensate, with a molecular pulse created every 7.2 ms. Furthermore, by careful control of the magnetic bias field and gradient we are able to utilise an avoided crossing in the bound state spectrum at 13.3G to demonstrate exquisite control over the dynamics of the molecular clouds.

17 pages, 9 figures

References in corpus (19)

• A High Phase-Space-Density Gas of Polar Molecules
• Magneto-optical trapping of a diatomic molecule
• Quo vadis, cold molecules? - Editorial review
• Quantum Gas of Deeply Bound Ground State Molecules
• Ultracold Molecules in the Ro-Vibrational Triplet Ground State
• Observation of molecules produced from a Bose-Einstein condensate
• Dual-Species Bose-Einstein Condensate of ${}^{87}$Rb and ${}^{133}$Cs
• Fast, Runaway Evaporative Cooling to Bose-Einstein Condensation in Optical Traps
• Molecule formation in ultracold atomic gases
• Feshbach resonances, weakly bound molecular states and coupled-channel potentials for cesium at high magnetic fields
• Determination of atomic scattering lengths from measurements of molecular binding energies near Feshbach resonances
• Imaging of s and d partial-wave interference in quantum scattering of identical bosonic atoms
• Spectroscopy of Ultracold, Trapped Cesium Feshbach Molecules
• `Stückelberg interferometry' with ultracold molecules
• Collisions between tunable halo dimers: exploring an elementary four-body process with identical bosons
• Efficient creation of molecules from a cesium Bose-Einstein condensate
• A high phase-space density mixture of ${}^{87}$Rb and ${}^{133}$Cs: towards ultracold heteronuclear molecules
• Metastable Feshbach Molecules in High Rotational States
• Bose-Einstein condensation of 85Rb by direct evaporation in an optical dipole trap

Cited by in corpus (1)

• Feshbach Spectroscopy of Cs Atom Pairs in Optical Tweezers