Now showing items 1-16 of 16

  • Classical and quantum simulations of dislocations in crystals 

    Sempere Llagostera, Santiago (Universitat Politècnica de Catalunya, 2016-10-17)
    Bachelor thesis
    36 months embargo
    Covenantee:  University of New South Wales
  • Contact interactions in path integral Monte Carlo simulations 

    Cirauqui García, David (Universitat Politècnica de Catalunya, 2016-06-20)
    Bachelor thesis
    Open Access
    In very dilute Bose gases the full interatomic interaction can be well modeled by the s-wave scattering length defining the strength of a contact interaction. To introduce this kind of potential in quantum simulations is ...
  • Design and construction of optical superlattices for a quantum gas experiment 

    Sastre Pellicer, Jordi (Universitat Politècnica de Catalunya, 2015-10)
    Bachelor thesis
    Open Access
    In recent years ultracold atomic gases have emerged as a new and promising platform for exploring the physics of quantum many-body systems, allowing researchers to revisit fundamental problems of condensed-matter physics ...
  • Estudi de l'3He bidimensional amb mètodes de Monte Carlo quàntics 

    Grau Torre-Marín, Victor (Universitat Politècnica de Catalunya, 2001-07-16)
    Doctoral thesis
    Open Access
    de la tesi <br/>En aquest treball es presenta un estudi de l'3He a temperatura zero combinant les tècniques de Monte Carlo variacional (VMC) i la difusiva (DMC) amb nodes fixos (FN) i relaxació dels nodes (RN). <br/>L'estudi ...
  • Microscopic description of confined bosonic dipolar quantum gases in two dimensions 

    Sánchez Baena, Juan (Universitat Politècnica de Catalunya, 2015-06-21)
    Bachelor thesis
    Open Access
    We present a microscopic description of the two dimensional quantum few body problem involving confined polarized bosons. Due to anisotropy of the dipolar interaction, the system presents an interesting behaviour in terms ...
  • Microscopic description of two dimensional dipolar quantum gases 

    Macía Rey, Adrián (Universitat Politècnica de Catalunya, 2015-02-13)
    Doctoral thesis
    Open Access
    A microscopic description of the many-body properties of anisotropic homogeneous gases of bosonic dipoles in two dimensions is presented and discussed. By changing the polarization angle with respect to the plane, we study ...
  • A Monte Carlo approach to statics and dynamics of quantum fluids 

    Ferré Porta, Guillem (Universitat Politècnica de Catalunya, 2017-09-16)
    Doctoral thesis
    Open Access
    The main objective of the thesis is to study static and/or dynamic properties of a set of quantum fluids by means of quantum Monte Carlo techniques, mainly using the path integral formalism to obtain results both at zero ...
  • Monte Carlo study of quantum phase transitions at zero temperature 

    Osychenko, Oleg N. (Universitat Politècnica de Catalunya, 2012-12-20)
    Doctoral thesis
    Open Access
    The Thesis is devoted to simulations of quantum phase transitions by means of Quantum Monte Carlo techniques. Quantum phase transition is a transition between phases at zero or low enough temperature, where quantum effects ...
  • Novel applications of Photonic Force Microscopy 

    Volpe, Giovanni (Universitat Politècnica de Catalunya, 2008-10-23)
    Doctoral thesis
    Open Access
    The ability of detecting farces and torques at the micro-and nano-scale is fundamental. When this Thesis started, various scanning probe techniques had already been developed to probe the mechanical properties of microsystems. ...
  • One dimensional quantum gases: from few to many 

    Amorós Binefa, Júlia (Universitat Politècnica de Catalunya, 2016-07-07)
    Bachelor thesis
    Open Access
    Covenantee:  Università degli studi di Trento
    The main objective of this project is to find the binding energy of an impurity interacting with a one-dimensional bosonic system of increasing size for different coupling strengths g. Both the bosons as well as the impurity ...
  • Path integral Monte Carlo. Algorithms and applications to quantum fluids 

    Brualla Barberà, Llorenç (Universitat Politècnica de Catalunya, 2002-07-11)
    Doctoral thesis
    Open Access
    Path integral Monte Carlo (PIMC) is a method suitable for quantum liquid simulations at finite temperature. We present in this thesis a study of PIMC dealing with the theory and algorithms related to it, and then two ...
  • Path Integral Monte Carlo and Bose-Einstein condensation in quantum fluids and solids 

    Rota, Riccardo (Universitat Politècnica de Catalunya, 2011-12-20)
    Doctoral thesis
    Open Access
    Several microscopic theories point out that Bose-Einstein condensation (BEC), i.e., a macroscopic occupation of the lowest energy single particle state in many-boson systems, may appear also in quantum fluids and solids ...
  • Probing the near-field optical response of plasmon nanostructures with two-photon luminescence microscopy 

    Ghenuche, Petru Virgil (Universitat Politècnica de Catalunya, 2009-04-02)
    Doctoral thesis
    Open Access
    Esta tesis describe el diseño, la fabricación y la caracterización óptica de sistemas plasmónicos resonantes capaces de confinar y aumentar campos de luz en la escala manométrica. En primer lugar, se utilizaron modelos ...
  • Propiedades dieléctricas y transición de fase del sistema BZT modificado con tierras raras 

    Boya Pimentel, Aurelio (Universitat Politècnica de Catalunya, 2010-06-17)
    Master thesis
    Open Access
    En este trabajo se ha investigado la influencia de la adición de tierras raras sobre la transición de fase y las propiedades dieléctricas del titanato circonato de bario, Ba(ZrxTi1-x)O3 (BZT). Las muestras fueron obtenidas ...
  • Quantum Many-Body Systems in 1D: One Dimensional Hydrogen 

    Vidal Arias, Alfredo José (Universitat Politècnica de Catalunya, 2015-06-22)
    Bachelor thesis
    Open Access
    The ground-state properties of one-dimensional spin polarized hydrogen, deuterium and tritium at zero temperature are obtained by means of Diffusion Monte Carlo calculations (DMC). The equations of state of the three ...
  • Swimmers’ Collective Dynamics Modelization 

    Ferré Porta, Guillem (Universitat Politècnica de Catalunya, 2011-09-22)
    Master thesis
    Open Access
    English: We describe a new model in order to study the properties of collections of self-propelled particles swimming in a two-dimensional fluid. Our model consist in two types of particles, the first interacting with each ...