We report the observation of a dimer-dimer inelastic collision resonance for ultracold Feshbach molecules made of bosonic sodium and rubidium atoms. This resonance, which we attribute to the crossing of the dimer-dimer threshold with a heteronuclear tetramer state, manifests itself as a pronounced inelastic loss peak of dimers when the interspecies scattering length between the constituent atoms is tuned. Near this resonance, a strong modification of the temperature dependence of the dimer-dimer scattering is observed. Our result provides insight into the heteronuclear four-body system consisting of heavy and light bosons and offers the possibility of investigating ultracold molecules with tunable interactions.We report the observation of a dimer-dimer inelastic collision resonance for ultracold Feshbach molecules made of bosonic sodium and rubidium atoms. This resonance, which we attribute to the crossing of the dimer-dimer threshold with a heteronuclear tetramer state, manifests itself as a pronounced inelastic loss peak of dimers when the interspecies scattering length between the constituent atoms is tuned. Near this resonance, a strong modification of the temperature dependence of the dimer-dimer scattering is observed. Our result provides insight into the heteronuclear four-body system consisting of heavy and light bosons and offers the possibility of investigating ultracold molecules with tunable interactions.

arXiv:1611.03198Physical Review AOct 14, 201916 citations

Feshbach Resonances in Ultracold Gases

Eite Tiesinga, Cheng Chin, Rudolf Grimm +1 more

APSMay 1, 200911 citations

Feshbach resonances in mixtures of ultracold Li6 and Rb87 gases

Benjamin Deh, C. Marzok, Claus Zimmermann +1 more

We report on the observation of two Feshbach resonances in collisions between ultracold $^{6}\mathrm{Li}$ and $^{87}\mathrm{Rb}$ atoms in their respective hyperfine ground states $\ensuremath{\mid}F,{m}_{F}⟩=\ensuremath{\mid}1∕2,1∕2⟩$ and \ensuremath{\mid}1,1⟩. The resonances show up as trap losses for the $^{6}\mathrm{Li}$ cloud induced by inelastic Li-Rb-Rb three-body collisions. The magnetic field values where they occur represent important benchmarks for an accurate determination of the interspecies interaction potentials. A broad Feshbach resonance located at $1066.92\phantom{\rule{0.3em}{0ex}}\mathrm{G}$ opens interesting prospects for the creation of ultracold heteronuclear molecules. We furthermore observe a strong enhancement of the narrow $p$ -wave Feshbach resonance in collisions of $^{6}\mathrm{Li}$ atoms at $158.55\phantom{\rule{0.3em}{0ex}}\mathrm{G}$ in the presence of a dense $^{87}\mathrm{Rb}$ cloud. The effect of the $^{87}\mathrm{Rb}$ cloud is to introduce Li-Li-Rb three-body collisions occurring at a higher rate than Li-Li-Li collisions.We report on the observation of two Feshbach resonances in collisions between ultracold $^{6}\mathrm{Li}$ and $^{87}\mathrm{Rb}$ atoms in their respective hyperfine ground states $\ensuremath{\mid}F,{m}_{F}⟩=\ensuremath{\mid}1∕2,1∕2⟩$ and \ensuremath{\mid}1,1⟩. The resonances show up as trap losses for the $^{6}\mathrm{Li}$ cloud induced by inelastic Li-Rb-Rb three-body collisions. The magnetic field values where they occur represent important benchmarks for an accurate determination of the interspecies interaction potentials. A broad Feshbach resonance located at $1066.92\phantom{\rule{0.3em}{0ex}}\mathrm{G}$ opens interesting prospects for the creation of ultracold heteronuclear molecules. We furthermore observe a strong enhancement of the narrow $p$-wave Feshbach resonance in collisions of $^{6}\mathrm{Li}$ atoms at $158.55\phantom{\rule{0.3em}{0ex}}\mathrm{G}$ in the presence of a dense $^{87}\mathrm{Rb}$ cloud. The effect of the $^{87}\mathrm{Rb}$ cloud is to introduce Li-Li-Rb three-body collisions occurring at a higher rate than Li-Li-Li collisions.

arXiv:0709.4554Physical Review AJan 8, 200884 citations

Observation of Feshbach Resonances between Two Different Atomic Species

Claudiu A. Stan, Martin W. Zwierlein, Christian H. Schunck +2 more

We have observed three Feshbach resonances in collisions between $^{6}\mathrm{L}\mathrm{i}$ and $^{23}\mathrm{N}\mathrm{a}$ atoms. The resonances were identified as narrow loss features when the magnetic field was varied. The molecular states causing these resonances have been identified, and additional $^{6}\mathrm{L}\mathrm{i}\mathrm{\text{\ensuremath{-}}}^{23}\mathrm{N}\mathrm{a}$ resonances are predicted. These resonances will allow the study of degenerate Bose-Fermi mixtures with adjustable interactions and could be used to generate ultracold heteronuclear molecules.We have observed three Feshbach resonances in collisions between $^{6}\mathrm{L}\mathrm{i}$ and $^{23}\mathrm{N}\mathrm{a}$ atoms. The resonances were identified as narrow loss features when the magnetic field was varied. The molecular states causing these resonances have been identified, and additional $^{6}\mathrm{L}\mathrm{i}\mathrm{\text{\ensuremath{-}}}^{23}\mathrm{N}\mathrm{a}$ resonances are predicted. These resonances will allow the study of degenerate Bose-Fermi mixtures with adjustable interactions and could be used to generate ultracold heteronuclear molecules.

arXiv:cond-mat/0406129Physical Review LettersSep 30, 2004270 citations

High precision Feshbach spectroscopy of ultracold cesium collisions

Cheng Chin, Vladan Vuletić, Andrew J. Kerman +1 more

Nuclear Physics AMar 1, 20019 citations

We report on the observation of two Feshbach resonances in collisions between ultracold

^{6}\mathrm{Li}

and

^{87}\mathrm{Rb}

atoms in their respective hyperfine ground states $\ensuremath{\mid}F,{m}_{F}⟩=\ensuremath{\mid}1∕2,1∕2⟩$ and \ensuremath{\mid}1,1⟩. The resonances show up as trap losses for the

^{6}\mathrm{Li}

cloud induced by inelastic Li-Rb-Rb three-body collisions. The magnetic field values where they occur represent important benchmarks for an accurate determination of the interspecies interaction potentials. A broad Feshbach resonance located at

1066.92\phantom{\rule{0.3em}{0ex}}\mathrm{G}

opens interesting prospects for the creation of ultracold heteronuclear molecules. We furthermore observe a strong enhancement of the narrow

p

-wave Feshbach resonance in collisions of

^{6}\mathrm{Li}

atoms at

158.55\phantom{\rule{0.3em}{0ex}}\mathrm{G}

in the presence of a dense

^{87}\mathrm{Rb}

cloud. The effect of the

^{87}\mathrm{Rb}

cloud is to introduce Li-Li-Rb three-body collisions occurring at a higher rate than Li-Li-Li collisions.

We have observed three Feshbach resonances in collisions between

^{6}\mathrm{L}\mathrm{i}

and

^{23}\mathrm{N}\mathrm{a}

atoms. The resonances were identified as narrow loss features when the magnetic field was varied. The molecular states causing these resonances have been identified, and additional $^{6}\mathrm{L}\mathrm{i}\mathrm{\text{\ensuremath{-}}}^{23}\mathrm{N}\mathrm{a}$ resonances are predicted. These resonances will allow the study of degenerate Bose-Fermi mixtures with adjustable interactions and could be used to generate ultracold heteronuclear molecules.