Abstract
The route towards a Bose–Einstein condensate (BEC) of dipolar molecules requires the ability to efficiently associate dimers of different chemical species and transfer them to the stable rovibrational ground state. Here, we report on recent spectroscopic measurements of two weakly bound molecular levels and newly observed narrow d-wave Feshbach resonances. The data are used to improve the collisional model for the Bose–Bose mixture 41K87Rb, one of the most promising candidates to create a molecular dipolar BEC.
Highlights
A new tide in the domain of quantum degenerate gases is rising
We report here two different results which are both important for improving the accuracy of the collisional model for 41K87Rb, namely the measurement of the binding energies of the s-wave Feshbach dimers and the detection of two narrow d-wave Feshbach resonances
We have shown that recently published data on rf association of Feshbach dimers and newly determined Feshbach resonances in higher order partial waves lead to an improved collisional model for 41K87Rb
Summary
A new tide in the domain of quantum degenerate gases is rising. Degenerate dipolar molecules, created from ultracold or degenerate atoms, are within reach. Such molecules will enable the study of zero-temperature systems with strong long-range interactions, whereas degenerate atoms interact substantially only through contact potentials. Degenerate molecules with dipole-dipole interactions will provide new quantum phases, will allow the simulation of magnetic spin systems and will provide candidate qubits for quantum computation. Ultracold molecules have been produced by several groups, using either laser cooled atoms in a magneto-optical trap (MOT) [1] or degenerate atoms [2]. Due to the energymomentum conservation, molecular association cannot be a simple two-body process but requires a three-body collision, the exchange of photons (photoassociation) or adiabatic transitions (magnetoassociation)
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