Now showing items 1-20 of 31

    • 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; Kakeh Burgada, Nabil (Universitat Politècnica de Catalunya, 2018-06-08)
      Exam
      Restricted access to the UPC academic community
    • 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 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 ...
    • Measuring topological invariants in a polaritonic analog of graphene 

      Real, Bastian; Dauphin, Alexandre; Massignan, Pietro Alberto; Sagnes, Isabelle; Jamadi, Omar; Milicevic, Marijane; Lemaitre, Aristide; Harouri, Abdelmounaim; Le Gratiet, Luc; Ravets, Sylvain; Bloch, Jaqueline; Amo, Alberto (American Institute of Physics (AIP), 2021-03-25)
      Article
      Open Access
      Topological materials rely on engineering global properties of their bulk energy bands called topo- logical invariants. These invariants, usually defined over the entire Brillouin zone, are related to the existence of ...
    • MF: Final exam: spring 2019 

      Ribas Prats, Francesca; Massignan, Pietro Alberto; Kakeh Burgada, Nabil (Universitat Politècnica de Catalunya, 2019-06-05)
      Exam
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    • 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
    • Mobile impurity in a Bose-Einstein condensate and the orthogonality catastrophe 

      Guenther, Nils Eric; Schmidt, Richard; Bruun, Georg M.; Gurarie, Victor; Massignan, Pietro Alberto (American Physical Society, 2021-01-01)
      Article
      Open Access
      We analyze the properties of an impurity in a dilute Bose-Einstein condensate (BEC). First the quasiparticle residue of a static impurity in an ideal BEC is shown to vanish with increasing particle number as a stretched ...
    • 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 ...
    • Renormalization-group study of Bose polarons 

      Isaule, Felipe; Morera Navarro, Iván; Massignan, Pietro Alberto; Julia Diaz, Bruno (American Physical Society, 2021-08-01)
      Article
      Open Access
      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 ...