Observation of Heteronuclear Feshbach Molecules from a ${}^{85}$Rb - ${}^{87}$Rb gas

Abstract

We report on the observation of ultracold heteronuclear Feshbach molecules. Starting with a ${}^{87}$Rb BEC and a cold atomic gas of ${}^{85}$Rb, we utilize previously unobserved interspecies Feshbach resonances to create up to 25,000 molecules. Even though the ${}^{85}$Rb gas is non-degenerate we observe a large molecular conversion efficiency due to the presence of a quantum degenerate ${}^{87}$Rb gas; this represents a key feature of our system. We compare the molecule creation at two different Feshbach resonances with different magnetic-field widths. The two Feshbach resonances are located at $265.44\pm 0.15$ G and $372.4\pm 1.3$ G. We also directly measure the small binding energy of the molecules through resonant magnetic-field association.

arXiv commentv2 - minor changes

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• Interface Tension of Bose-Einstein Condensates
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• Quantum mixtures of ultracold gases of neutral atoms
• Feshbach resonances in ultracold 85Rb-87Rb and 6Li-87Rb mixtures
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• Atomic Josephson junction with two bosonic species
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• Association of molecules using a resonantly modulated magnetic field
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• Measurement of inelastic losses in a sample of ultracold Rb-85
• Ground states of a mixture of two species of spin-1 Bose gases with interspecies spin exchange in a magnetic field
• The dominant scattering channel induced by two-body collision of D-band atoms in triangular optical lattice
• Heteronuclear quantum gas mixtures
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