Feshbach resonances in ultracold 85Rb

Abstract

We present 17 experimentally confirmed Feshbach resonances in optically trapped 85Rb. Seven of the resonances are in the ground-state channel (f,m_f) = (2,+2)+(2,+2), and nine are in the excited-state channel (2,-2)+(2,-2). We find a wide resonance at high field in each of the two channels, offering new possibilities for the formation of larger 85Rb condensates and studies of few-body physics. A detailed coupled-channels analysis is presented to characterize the resonances, and also provides an understanding of the inelastic losses observed in the excited-state channel. In addition we have confirmed the existence of one narrow resonance in a (2,+2)+(3,+3) spin mixture.

8 pages, 6 Figures

References in corpus (14)

• A High Phase-Space-Density Gas of Polar Molecules
• Formation of bright matter-wave solitons during the collapse of Bose-Einstein condensates
• Ultracold Molecules in the Ro-Vibrational Triplet Ground State
• Dual-Species Bose-Einstein Condensate of ${}^{87}$Rb and ${}^{133}$Cs
• Hyperfine, rotational, and vibrational structure of the triplet ground state of Rb molecules
• Feshbach resonances in ultracold atomic and molecular collisions: threshold behaviour and suppression of poles in scattering lengths
• Ultracold atom-molecule collisions and bound states in magnetic fields: tuning zero-energy Feshbach resonances in He-NH (3Sigma-)
• Collisions between tunable halo dimers: exploring an elementary four-body process with identical bosons
• Avoided crossings between bound states of ultracold Cesium dimers
• Spontaneous dissociation of long-range Feshbach molecules
• Production of three-body Efimov molecules in an optical lattice
• A high phase-space density mixture of ${}^{87}$Rb and ${}^{133}$Cs: towards ultracold heteronuclear molecules
• Feshbach spectroscopy of an ultracold mixture of ${}^{85}$Rb and ${}^{133}$Cs
• Bose-Einstein condensation of 85Rb by direct evaporation in an optical dipole trap