Association of ultracold double-species bosonic molecules

Year: 2008

Authors: Weber C., Barontini G., Catani J., Thalhammer G., Inguscio M., Minardi F.

Autors Affiliation: LENS, European Laboratory for Non-Linear Spectroscopy and Dipartimento di Fisica,
Università di Firenze, via N. Carrara 1, I-50019 Sesto Fiorentino, Firenze, Italy;
CNR-INFM, via G. Sansone 1, I-50019 Sesto Fiorentino, Firenze, Italy;
Institut für Angewandte Physik, Universität Bonn, Wegelerstraße 8, D-53115 Bonn, Germany

Abstract: We report on the creation of heterospecies bosonic molecules, associated from an ultracold Bose-Bose mixture of (41)K and (87)Rb, by using a resonantly modulated magnetic field close to two Feshbach resonances. We measure the binding energy of the weakly bound molecular states versus the Feshbach field and compare our results to theoretical predictions. We observe the broadening and asymmetry of the association spectrum due to the thermal distribution of the atoms and a frequency shift occurring when the binding energy depends nonlinearly on the Feshbach field. A simple model is developed to quantitatively describe the association process. This work represents a required step toward Bose-Einstein condensates of dipolar molecules.

Journal/Review: PHYSICAL REVIEW A

Volume: 78 (6)      Pages from: 061601  to: 061601

More Information: This work was supported by CNR (EuroQUAM-QUDIPMOL), Ente CdR Firenze, EU (STREP NAME-QUAM, CHIMONO), and INFN (SQUAT-Super). We thank G. Varoquaux, A. Simoni, F. Ferlaino, and our colleagues of the Quantum Degenerate Gases group at LENS for fruitful discussions.
KeyWords: Atomic spectroscopy; Atoms; Binding sites; Bose-Einstein condensation; Magnetic fields; Molecules; Nuclear energy; Potential energy; Rubidium; Steam condensers, Association processes; Bosonic molecules; Dipolar molecules; Einstein condensates; Feshbach; Feshbach resonances; Frequency shifts; Modulated magnetic fields; Molecular states; SIMPLE models; Ultra colds, Binding energy
DOI: 10.1103/PhysRevA.78.061601

Citations: 59
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