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



Autor: S. Knoop, M. Mark, F. Ferlaino, J.G. Danzl, T. Kraemer, H.-C. Naegerl, R. Grimm

Fuente: https://arxiv.org/







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