Metastable Feshbach Molecules in High Rotational States

Abstract

We experimentally demonstrate Cs2 Feshbach molecules well above the dissociation threshold, which are stable against spontaneous decay on the timescale of one second. An optically trapped sample of ultracold dimers is prepared in an l-wave state and magnetically tuned into a region with negative binding energy. The metastable character of these molecules arises from the large centrifugal barrier in combination with negligible coupling to states with low rotational angular momentum. A sharp onset of dissociation with increasing magnetic field is mediated by a crossing with a g-wave dimer state and facilitates dissociation on demand with a well defined energy.

4 pages, 5 figures

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Cited by in corpus (19)

• Feshbach Resonances in Ultracold Gases
• Formation and interactions of cold and ultracold molecules: new challenges for interdisciplinary physics
• Towards the production of ultracold ground-state RbCs molecules: Feshbach resonances, weakly bound states, and coupled-channel model
• Feshbach spectroscopy and analysis of the interaction potentials of ultracold sodium
• Feshbach resonances, weakly bound molecular states and coupled-channel potentials for cesium at high magnetic fields
• Observation of interspecies Feshbach resonances in an ultracold Rb-Cs mixture
• Photodissociation of ultracold diatomic strontium molecules with quantum state control
• Analytic description of atomic interaction at ultracold temperatures: the case of a single channel
• Collisions between tunable halo dimers: exploring an elementary four-body process with identical bosons
• Quantum Simulations of Extended Hubbard Models with Dipolar Crystals
• Analytic description of atomic interaction at ultracold temperatures II: Scattering around a magnetic Feshbach resonance
• Role of spatial inhomogeneity in dissociation of trapped molecular condensates
• Rotational and rotationless states of weakly-bound molecules
• Collisions of Ultracold Trapped Cesium Feshbach Molecules
• Multichannel quantum-defect theory for magnetic Feshbach resonances in heteronuclear group I systems
• Universality in s-wave and higher partial wave Feshbach resonances: an illustration with a single atom near two scattering centers
• Deceleration of molecules in a supersonic beam by the optical field in a low-finesse cavity
• Repeated output coupling of ultracold Feshbach molecules from a Cs BEC
• Observation of high partial-wave Feshbach resonances in ${}^{39}$K Bose-Einstein condensates