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Observation of Efimov Resonances in a Mixture with Extreme Mass Imbalance

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arxiv 1403.7246 v2 pith:2URWC5AO submitted 2014-03-27 cond-mat.quant-gas nucl-thphysics.atom-phquant-ph

R. Pires , J. Ulmanis , S. Häfner , M. Repp , A. Arias , E.D. Kuhnle , M. Weidemüller This is my paper · ORCID
classification cond-mat.quant-gasnucl-thphysics.atom-phquant-ph
keywords resonancetemperatureclosecs-csefimovfieldli-csloss
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abstract

We observe two consecutive heteronuclear Efimov resonances in an ultracold Li-Cs mixture by measuring three-body loss coefficients as a function of magnetic field near a Feshbach resonance. The first resonance is detected at a scattering length of $a_-^{(1)}=-320(10)~a_0$ corresponding to $\sim 7 $ ($\sim 3$) times the Li-Cs (Cs-Cs) van der Waals range. The second resonance appears at $5.8(1.0) a_-^{(1)}$ close to the unitarity-limited regime at the sample temperature of 450 nK. Indication of a third resonance is found in the atom loss spectra. The scaling of the resonance positions is close to the universal scaling value of 4.9 predicted for zero temperature. Deviations from universality might be caused by finite-range and temperature effects, as well as magnetic field dependent Cs-Cs interactions.

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    A trial-wavefunction calculation predicts anomalous Rabi oscillations and a steady-state magnetization for strongly driven Bose polarons when attractive and repulsive polaron branches coexist.

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