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Showing 1–7 of 7 results
Advanced filters: Author: G. Roati Clear advanced filters

  • Vortex dynamics and mutual friction in quantum fluids are intimately connected to the fundamental properties of superfluids. Here, the authors reveal previously unexplored mechanisms underlying the mutual friction coefficients in ultracold Fermi superfluids in the unitary limit, suggesting bound quasiparticles within the vortex core play a significant role.

    • N. Grani
    • D. Hernández-Rajkov
    • G. Roati
    ResearchOpen Access
    Nature Communications
    Volume: 16, P: 1-11

  • In bosonic many-body systems, disorder tends to localize particles, whereas weak repulsive interactions between the particles have a delocalizing effect. The crossover between these regimes has now been studied experimentally, using an optical lattice to control disorder and interactions independently.

    • B. Deissler
    • M. Zaccanti
    • M. Inguscio
    Research
    Nature Physics
    Volume: 6, P: 354-358

  • Two adjacent layers flowing at different velocities in the same fluid are subject to flow instabilities. This phenomenon is now studied in atomic superfluids, revealing that quantized vortices act as both sources and probes of the unstable flow.

    • D. Hernández-Rajkov
    • N. Grani
    • G. Roati
    Research
    Nature Physics
    Volume: 20, P: 939-944

  • Fermi polarons are quasiparticles formed by impurities immersed in a Fermi gas. An experiment in an ultracold fermionic gas now shows how to control their properties with a tunable radio-frequency field.

    • Franklin J. Vivanco
    • Alexander Schuckert
    • Nir Navon
    ResearchOpen Access
    Nature Physics
    Volume: 21, P: 564-569

  • In 1970, Vitaly Efimov predicted that three interacting particles can form an infinite series of bound trimer states, even when none of the two-particle subsystems is stable. Experimental evidence for such an exotic state was obtained in 2006, but now an Efimov spectrum, containing two such states with the predicted scaling between them, has been observed.

    • M. Zaccanti
    • B. Deissler
    • G. Modugno
    Research
    Nature Physics
    Volume: 5, P: 586-591