17-22 July 2022
Royal Conservatory of Music, Toronto
America/Toronto timezone

Efimov universalities, Bose polarons and turbulence with ultracold 39K in a 3D box trap

19 Jul 2022, 17:00
1h 30m
Hart House (Hart House)

Hart House

Hart House

7 Hart House Cir, Toronto, ON M5S 3H3
Poster presentation Degenerate gases, many-body physics, and quantum simulation Poster session


We present on various experiments utilizing quantum $^{39}$K gases trapped in a 3D optical box for investigations of few-body, many-body and far-from-equilibrium phenomena. The first result we present is a comprehensive characterization of F=1 manifold Feshbach resonances for magnetic fields up to 600G using loss spectroscopy and atom-dimer interferometry; these precision measurements enable us to examine Efimov and van-der-Waals universality across multiple resonances. Our second main result is the realization of a uniform system of Bose polarons. We spectroscopically probe the polaron spectral function with minimal density broadening from weak to resonant couplings, and find evidence for coherent quantum beats between repulsive polaron and an impurity-phonon bound state at strong repulsive interactions under a Ramsay protocol. As a third result, we experimentally establish an equation of state relating the energy flux to the Kolmogorov number of the turbulent cascade established under strong forcing of an interacting condensate. This equation of state is independent of the details of the driving and dissipation, independent of history, and can be rescaled into a single curve for different interaction parameters. Finally, we surprisingly demonstrate that even a shaken noninteracting condensate exhibits a self-similar scaling dynamics in momentum space with a subdiffusive energy growth, qualitatively akin to interacting turbulent behavior but quantitatively different.

Presenter name Alec Cao

Primary authors

Alec Cao (University of Cambridge) Jiří Etrych (University of Cambridge) Gevorg Martirosyan (University of Cambridge) Lena Dogra (University of Cambridge) Dr Christoph Eigen (University of Cambridge) Prof. Zoran Hadzibabic (University of Cambridge)

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