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  • Coherent oscillations in small Fermi-polaron systems 

    Tylutki, Marek; Astrakharchik, Grigori; Recati, Alessio (AMER PHYSICAL SOC, 2017-12-01)
    Artículo
    Acceso abierto
    We study the ground state and excitations of a one-dimensional trapped polarized Fermi gas interacting with a single impurity. First, we study the tunneling dynamics of the impurity through a potential barrier, such as one ...

  • Effect of risk perception on epidemic spreading in temporal networks 

    Moinet, Antoine; Pastor Satorras, Romualdo; Barrat, Alain (American Chemical Society (ACS), 2018-01-31)
    Artículo
    Acceso abierto
    Many progresses in the understanding of epidemic spreading models have been obtained thanks to numerous modeling efforts and analytical and numerical studies, considering host populations with very different structures and ...

  • Effects of heterogeneous social interactions on flocking dynamics 

    Miguel Lopez, M. Del Carmen; Parley, Jack Thomas; Pastor Satorras, Romualdo (2018-02-08)
    Artículo
    Acceso abierto
    Social relationships characterize the interactions that occur within social species and may have an important impact on collective animal motion. Here, we consider a variation of the standard Vicsek model for collective ...

  • Bose polarons at finite temperature and strong coupling 

    Guenther, Nils Eric; Massignan, Pietro Alberto; Lewenstein, Maciej; Bruun, Georg (2018-02-01)
    Artículo
    Acceso abierto
    A mobile impurity coupled to a weakly interacting Bose gas, a Bose polaron, displays several interesting effects. While a single attractive quasiparticle is known to exist at zero temperature, we show here that the spectrum ...

  • Vortex dynamics in coherently coupled Bose-Einstein condensates 

    Calderaro, Luca; Fetter, Alexander L.; Massignan, Pietro Alberto; Wittek, Peter (AMER PHYSICAL SOC, 2017)
    Artículo
    Acceso restringido por política de la editorial
    In classical hydrodynamics with uniform density, vortices move with the local fluid velocity. This description is rewritten in terms of forces arising from the interaction with other vortices. Two such positive straight ...

  • Repulsive Fermi polarons in a resonant mixture of ultracold 6Li atoms 

    Scazza, F; Valtolina, G; Massignan, Pietro Alberto; Recati, Alessio; Amico, A; Burchianti, A; Fort, C; Inguscio, M; Zaccanti, M; Roati, G (2017)
    Artículo
    Acceso abierto
    We employ radio-frequency spectroscopy to investigate a polarized spin mixture of ultracold 6 Li atoms close to a broad Feshbach scattering resonance. Focusing on the regime of strong repulsive interactions, we observe ...

  • Universality of the unitary Fermi gas: A few-body perspective 

    Levinsen, Jesper; Massignan, Pietro Alberto; Endo, Shimpei; Parish, Meera M (2017)
    Artículo
    Acceso abierto
    We revisit the properties of the two-component Fermi gas with short-range interactions in three dimensions, in the limit where the s -wave scattering length diverges. Such a unitary Fermi gas pos- sesses universal thermodynamic ...

  • Detection of Zak phases and topological invariants in a chiral quantum walk of twisted photons 

    Cardano, Filippo; D'Errico, Alessio; dauphin, Alexandre; Maffei, Maria; Piccirillo, Bruno; de Lisio, Corrado; de Filippis, Guido; Cataudella, Vittorio; Santamato, Enrico; Marrucci, Lorenzo; Lewenstein, Maciej; Massignan, Pietro Alberto (2017)
    Artículo
    Acceso abierto
    Topological insulators are fascinating states of matter exhibiting protected edge states and robust quantized features in their bulk. Here we propose and validate experimentally a method to detect topological properties ...

  • Measuring Chern numbers in Hofstadter strips 

    Mugel, Samuel; dauphin, Alexandre; Massignan, Pietro Alberto; Tarruell, Leticia; Lewenstein, Maciej; Lobo, Carlos; Celi, Alessio (2017-08-15)
    Artículo
    Acceso abierto
    Topologically non-trivial Hamiltonians with periodic boundary conditions are characterized by strictly quantized invariants. Open questions and fundamental challenges concern their existence, and the possibility of measuring ...

  • Few trapped quantum dipoles: quantum versus classical structures 

    Sánchez Baena, Juan; Mazzanti Castrillejo, Fernando Pablo; Boronat Medico, Jordi (2018-01-31)
    Artículo
    Acceso abierto
    We analyze the ground state of a two-dimensional quantum system of a few strongly confined dipolar bosons. Dipoles arrange in different stable structures that depend on the tilting polarization angle and the anisotropy of ...

  • Andreev-Bashkin effect in superfluid cold gases mixtures 

    Nespolo, Jacopo; Astrakharchik, Grigori; Recati, Alessio (2017-12-05)
    Artículo
    Acceso abierto
    © 2017 The Author(s). Published by IOP Publishing Ltd on behalf of Deutsche Physikalische Gesellschaft. We study a mixture of two superfluids with density-density and current-current (Andreev-Bashkin) interspecies interactions. ...

  • Observation of dynamic atom-atom correlation in liquid helium in real space 

    Dmowski, Wojtek; Diallo, Souleymane Omar; Lokshin, Konstantin A.; Ehlers, Georg; Ferré Porta, Guillem; Boronat Medico, Jordi; Egami, Takeshi (2017-05-04)
    Artículo
    Acceso abierto
    © The Author(s) 2017. Liquid 4He becomes superfluid and flows without resistance below temperature 2.17 K. Superfluidity has been a subject of intense studies and notable advances were made in elucidating the phenomenon ...

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