Now showing items 1-20 of 24

    • Beyond-Luttinger-liquid thermodynamics of a one-dimensional Bose gas with repulsive contact interactions 

      Rosi, Giulia de; Massignan, Pietro Alberto; Lewenstein, Maciej; Astrakharchik, Grigori (American Physical Society, 2019-11-07)
      Article
      Open Access
      We present a thorough study of the thermodynamics of a one-dimensional repulsive Bose gas, focusing in particular on corrections beyond the Luttinger-liquid description. We compute the chemical potential, pressure, and ...
    • Bose polarons at finite temperature and strong coupling 

      Guenther, Nils Eric; Massignan, Pietro Alberto; Lewenstein, Maciej; Bruun, Georg (2018-02-01)
      Article
      Open Access
      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 ...
    • Bulk detection of time-dependent topological transitions in quenched chiral models 

      D'Errico, Alessio; Barboza, Raouf; Dauphin, Alexandre; Lewenstein, Maciej; Massignan, Pietro Alberto; Marrucci, Lorenzo; Cardano, Filippo; Di Colandrea, Francesco (American Physical Society, 2020-05)
      Article
      Open Access
      The topology of one-dimensional chiral systems is captured by the winding number of the Hamiltonian eigenstates. Here we show that this invariant can be read out by measuring the mean chiral displacement of a single-particle ...
    • Detecting topology through dynamics in interacting fermionic wires 

      Haller, Andreas; Massignan, Pietro Alberto; Rizzi, Mateo (American Physical Society, 2020-08-05)
      Article
      Open Access
      Probing the topological invariants of interacting systems stands as a grand and open challenge. Here we describe a dynamical method to characterize 1D chiral models, based on the direct observation of time-evolving bulk ...
    • 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)
      Article
      Open Access
      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 ...
    • Dropping an impurity into a Chern insulator: A polaron view on topological matter 

      Camacho-Guardián, Arturo; Goldman, Nathan; Massignan, Pietro Alberto; Bruun, Georg M. (American Physical Society (APS), 2019-02-05)
      Article
      Open Access
      We investigate the properties of an impurity particle interacting with a Fermi gas in a Cherninsulating state. The interaction leads to the formation of an exotic polaron, which consists of a coherent superposition of the ...
    • Examen final 

      Ribas Prats, Francesca; Massignan, Pietro Alberto; Ayats López, Roger (Universitat Politècnica de Catalunya, 2019-01-11)
      Exam
      Restricted access to the UPC academic community
    • Examen final 

      Ribas Prats, Francesca; Massignan, Pietro Alberto; Kakeh Burgada, Nabil (Universitat Politècnica de Catalunya, 2018-06-08)
      Exam
      Restricted access to the UPC academic community
    • Examen MQ 

      Ribas Prats, Francesca; Massignan, Pietro Alberto (Universitat Politècnica de Catalunya, 2018-10-30)
      Exam
      Restricted access to the UPC academic community
    • Examen MQ 

      Ribas Prats, Francesca; Massignan, Pietro Alberto (Universitat Politècnica de Catalunya, 2018-04-13)
      Exam
      Restricted access to the UPC academic community
    • From quantum quasiparticles to a classical gas 

      Massignan, Pietro Alberto (American Physical Society, 2019-03-06)
      Article
      Open Access
    • Measuring Chern numbers in Hofstadter strips 

      Mugel, Samuel; dauphin, Alexandre; Massignan, Pietro Alberto; Tarruell, Leticia; Lewenstein, Maciej; Lobo, Carlos; Celi, Alessio (2017-08-15)
      Article
      Open Access
      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 ...
    • MF: Final exam: spring 2019 

      Ribas Prats, Francesca; Massignan, Pietro Alberto; Kakeh Burgada, Nabil (Universitat Politècnica de Catalunya, 2019-06-05)
      Exam
      Restricted access to the UPC academic community
    • MF: Midterm exam: spring 2019 

      Ribas Prats, Francesca; Massignan, Pietro Alberto (Universitat Politècnica de Catalunya, 2019-03-27)
      Exam
      Restricted access to the UPC academic community
    • 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
      Open Access
      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 ...
    • 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
      Open Access
      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)
      Book
      Restricted access to the UPC academic community
      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 ...
    • 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
      Open Access
      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 ...
    • 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
      Open Access
      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 planar sectors and cones 

      Massignan, Pietro Alberto; Fetter, Alexander L. (American Physical Society (APS), 2019-06-07)
      Article
      Open Access
      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 ...