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

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• Observation of broad p-wave Feshbach resonances in ultracold ${}^{85}$Rb-${}^{87}$Rb mixtures
• Efimov states near a Feshbach resonance and the limits of van der Waals universality at finite background scattering length
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• Characterizing Feshbach resonances in ultracold scattering calculations
• Spin-conservation propensity rule for three-body recombination of ultracold Rb atoms
• Analog vacuum decay from vacuum initial conditions
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• Characterizing quasibound states and scattering resonances
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• Universal Three-Body Parameter of Heavy-Heavy-Light systems with negative intraspecies scattering length
• Time delays in ultracold atomic and molecular collisions
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• Entangling two distinguishable quantum bright solitons via collisions
• Modeling atom-atom interactions at low energy by Jost-Kohn potentials
• Suppression of two-body collisional loss in an ultracold gas via the Fano effect
• Splitting and recombination of bright-solitary-matter waves
• Observation of high partial-wave Feshbach resonances in ${}^{39}$K Bose-Einstein condensates
• Resonant Floquet Scattering of Ultracold Atoms
• Quasi-integrability and nonlinear resonances in cold atoms under modulation
• Quantum Degenerate Mixtures of Cs and Yb