Exploració per autor "Massignan, Pietro Alberto"Més informacióMés informació

Ara es mostren els items 21-40 de 40

    • Observation of the topological Anderson insulator in disordered atomic wires 

      Meier, Eric J.; An, Fangzhao Alex; Dauphin, Alexandre; Maffei, Maria; Massignan, Pietro Alberto; Hughes, Taylor L.; Gadway, Bryce (2018-11-23)
      Article
      Accés obert
      Topology and disorder have a rich combined influence on quantum transport. In order to probe their interplay, we synthesized one-dimensional chiral symmetric wires with controllable disorder via spectroscopic Hamiltonian ...

    • Polarons, dressed molecules and itinerant ferromagnetism in ultracold Fermi gases 

      Massignan, Pietro Alberto; Zaccanti, Matteo; Bruun, Georg M. (Institute of Physics (IOP), 2014-02-19)
      Article
      Accés obert
      In this review, we discuss the properties of a few impurity atomsimmersed in a gas of ultracold fermions, the so-called Fermi polaron problem. On one side, this many-body system is appealing because it can be described ...

    • Quantized superfluid vortex dynamics on cylindrical surfaces and planar annuli 

      Guenther, Nils Eric; Massignan, Pietro Alberto; Fetter, Alexander L. (AMER PHYSICAL SOC, 2017-12-06)
      Article
      Accés obert
      Superfluid vortex dynamics on an infinite cylinder differs significantly from that on a plane. The requirement that a condensate wave function be single valued upon once encircling the cylinder means that such a single ...

    • Quantum computing : problems and exercises 

      Torres Gil, Santiago; Bruna Escuer, Pere; Massignan, Pietro Alberto (Iniciativa Digital Politècnica. Oficina de Publicacions Acadèmiques Digitals de la UPC, 2020-07)
      Llibre
      Accés obert
      Quantum technology is one of the most promising and challenging fields in contemporary science. Quantum computing, quantum cryptography, and more generally quantum information technologies claim that they, in the short ...

    • Renormalization-group study of Bose polarons 

      Isaule, Felipe; Morera Navarro, Iván; Massignan, Pietro Alberto; Julia Diaz, Bruno (American Physical Society, 2021-08-01)
      Article
      Accés obert
      We study the properties of a single impurity in a dilute Bose gas, a Bose polaron, using the functional renormalization group. We use an ansatz for the effective action motivated by a derivative expansion, and we compute ...

    • Repulsive fermi and Bose polarons in quantum gases 

      Scazza, F; Zaccanti, Matteo; Massignan, Pietro Alberto; Parish, Meera M; Levinsen, Jesper (2022-05-27)
      Article
      Accés obert
      Polaron quasiparticles are formed when a mobile impurity is coupled to the elementary excitations of a many-particle background. In the field of ultracold atoms, the study of the associated impurity problem has attracted ...

    • 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)
      Article
      Accés obert
      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 ...

    • Stability and breakdown of Fermi polarons in a strongly interacting Fermi-Bose mixture 

      Fritsche, Isabella; Baroni, Cosetta; Dobler, Erich; Kirilov, Emil; Huang, Bo; Grimm, Rudolf; Bruun, Georg M.; Massignan, Pietro Alberto (American Physical Society, 2021-05-01)
      Article
      Accés obert
      We investigate the properties of a strongly interacting imbalanced mixture of bosonic 41K impurities immersed in a Fermi sea of ultracold 6 Li atoms. This enables us to explore the Fermi polaron scenario for large impurity ...

    • Strongly interacting impurities in a dilute Bose condensate 

      Yegovtsev, Nikolay; Massignan, Pietro Alberto; Gurarie, Victor (American Physical Society, 2022-09-01)
      Article
      Accés obert
      An impurity in a Bose gas is commonly referred to as a Bose polaron. For a dilute Bose gas, its properties are expected to be universal, i.e., dependent only on a few parameters characterizing the boson-impurity interactions. ...

    • Superfluid vortex dynamics on a torus and other toroidal surfaces of revolution 

      Guenther, Nils Eric; Massignan, Pietro Alberto; Fetter, Alexander L. (American Physical Society (APS), 2020-05-04)
      Article
      Accés obert
      The superfluid flow velocity is proportional to the gradient of the phase of the superfluid order parameter, leading to the quantization of circulation around a vortex core. In this work, we study the dynamics of a ...

    • Superfluid vortex dynamics on an ellipsoid and other surfaces of revolution 

      Caracanhas, Monica A.; Massignan, Pietro Alberto; Fetter, Alexander L. (American Physical Society, 2022-02-01)
      Article
      Accés obert
      We study the dynamics of quantized superfluid vortices on axisymmetric compact surfaces with no holes, where the total vortex charge must vanish and the condition of irrotational flow forbids distributed vorticity. A ...

    • Superfluid vortex dynamics on planar sectors and cones 

      Massignan, Pietro Alberto; Fetter, Alexander L. (American Physical Society (APS), 2019-06-07)
      Article
      Accés obert
      We study the dynamics of vortices formed in a superfluid film adsorbed on the curved two-dimensional surface of a cone. To this aim, we observe that a cone can be unrolled to a sector on a plane with periodic boundary ...

    • Thermal instability, evaporation, and thermodynamics of one-dimensional liquids in weakly interacting Bose-Bose mixtures 

      Rosi, Giulia de; Astrakharchik, Grigori; Massignan, Pietro Alberto (American Physical Society (APS), 2021-04-12)
      Article
      Accés obert
      We study the low-temperature thermodynamics of weakly interacting uniform liquids in one-dimensional attractive Bose-Bose mixtures. The Bogoliubov approach is used to simultaneously describe quantum and thermal fluctuations. ...

    • Topological characterization of chiral models through their long time dynamics 

      Maffei, Maria; Dauphin, Alexandre; Cardano, Filippo; Lewenstein, Maciej; Massignan, Pietro Alberto (2018-01-16)
      Article
      Accés obert
      We study chiral models in one spatial dimension, both static and periodically driven. We demonstrate that their topological properties may be read out through the long time limit of a bulk observable, the mean chiral ...

    • Topological transport of mobile impurities 

      Pimenov, Dimitri; Camacho-Guardián, Arturo; Goldman, Nathan; Massignan, Pietro Alberto; Bruun, Georg M.; Goldstein, Moshe (American Physical Society (APS), 2021-06-15)
      Article
      Accés obert
      We study the Hall response of topologically trivial mobile impurities (Fermi polarons) interacting weakly with majority fermions forming a Chern-insulator background. This setting involves a rich interplay between the ...

    • Two-dimensional topological quantum walks in the momentum space of structured light 

      Massignan, Pietro Alberto; D'Errico, Alessio; Cardano, Filippo; Maffei, Maria; Dauphin, Alexandre; Esposito, Chiara; Piccirillo, Bruno; Marrucci, Lorenzo; Lewenstein, Maciej; Barboza, Raouf (Optical Society of American (OSA), 2020-02-20)
      Article
      Accés obert
      Quantum walks are powerful tools for quantum applications and for designing topological systems. Although they are simulated in a variety of platforms, genuine two-dimensional realizations are still challenging. Here we ...

    • Ultra-long quantum walks via spin–orbit photonics 

      Di Colandrea, Francesco; Babazadeh, Amin; Dauphin, Alexandre; Massignan, Pietro Alberto; Marrucci, Lorenzo; Cardano, Filippo (Optical Society of American (OSA), 2023-03-01)
      Article
      Accés obert
      The possibility of fine-tuning the couplings between optical modes is a key requirement in pho- tonic circuits for quantum simulations. In these architectures, emulating the long-time evolution of particles across large ...

    • Universal aspects of a strongly interacting impurity in a dilute bose condensate 

      Massignan, Pietro Alberto; Yegovtsev, Nikolay; Gurarie, Victor (American Institute of Physics (AIP), 2021-03-26)
      Article
      Accés obert
      We study the properties of an impurity immersed in a weakly interacting Bose gas, i.e., of a Bose polaron. In the perturbatively-tractable of limit weak impurity-boson interactions many of its properties are known to ...

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

      Levinsen, Jesper; Massignan, Pietro Alberto; Endo, Shimpei; Parish, Meera M (2017)
      Article
      Accés obert
      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 ...

    • Vortex dynamics in coherently coupled Bose-Einstein condensates 

      Calderaro, Luca; Fetter, Alexander L.; Massignan, Pietro Alberto; Wittek, Peter (AMER PHYSICAL SOC, 2017)
      Article
      Accés restringit per política de l'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 ...