Sökning: "hubbard model"

Visar resultat 1 - 5 av 18 uppsatser innehållade orden hubbard model.

  1. 1. Investigation of a newrepresentation of spin

    Kandidat-uppsats, Uppsala universitet/Materialteori

    Författare :Minna Palmgren Thun; [2023]
    Nyckelord :Material theory; Spin; Statistical physics; Second quantization; Materialteori; spinn;

    Sammanfattning : The Bose-Hubbard Model, a tight binding model within solid state theory can be solved exactly using a number theoretical approach. From this approach, in the two sited Bose-Hubbard model, the hopping term in the model takes the form of a Pauli x matrix. The hopping term can be interpreted as a two energy level system or a dimer with k+1 particles. LÄS MER

  3. 2. Quantum thermodynamics explorations with a Hubbard-Holstein dimer

    Kandidat-uppsats, Lunds universitet/Matematisk fysik; Lunds universitet/Fysiska institutionen

    Författare :Emil Adam Jonatan Östberg; [2021]
    Nyckelord :QTD Quantum Thermodynamics Hubbard-Holstein Hubbard Holstein dimer Lanczos Suzuki-Trotter ST Exact diagonalization ED Hysteresis Path dependence Battery Mott-insulator; Physics and Astronomy;

    Sammanfattning : The goal of this project is to characterize the quantum thermodynamics of a Hubbard-Holstein dimer. We explore how the standard formalism of quantum thermodynamics behaves in the context many-body physics. LÄS MER

  4. 3. Machine-Learning for Lattice Models in and out of Equilibrium

    Master-uppsats, Lunds universitet/Matematisk fysik; Lunds universitet/Fysiska institutionen

    Författare :Johannes Sandberg; [2021]
    Nyckelord :Physics and Astronomy;

    Sammanfattning : Machine-learning methods have in recent years seen a great deal of use in condensed matter physics. In this thesis we apply such methods, specifically machine-learning with artificial neural networks, to the equilibrium and non-equilibrium description of the Hubbard and Hubbard-Holstein models. LÄS MER

  5. 4. Quantum programming and simulation of the Hubbard model using Q#

    Kandidat-uppsats, KTH/Skolan för teknikvetenskap (SCI)

    Författare :Henric Hintze; [2020]
    Nyckelord :;

    Sammanfattning : This paper gives a brief introduction to the basic concepts of quantum computing and simulation as well as quantum programming using Q#. These concepts are then applied by implementing the 2D Hubbard model for fermions interacting on a lattice. LÄS MER

  7. 5. Ensemble Green's Function Theory for Interacting Electrons with Degenerate Ground States

    Master-uppsats, Lunds universitet/Matematisk fysik; Lunds universitet/Fysiska institutionen

    Författare :Erik Linnér; [2019]
    Nyckelord :Green s function; Degeneracy; Density matrix; Ensemble; GW; Zero-temperature; Finite-temperature; Hubbard model; Two-dimensional harmonic oscillator; Ising model; Hydrogen-like model; Physics and Astronomy;

    Sammanfattning : An ensemble Green's function theory for many-electron systems with degenerate ground states, based on the von Neumann density matrix formalism, is proposed. The formalism is constructed without an assumption of an adiabatic connection. An ensemble analogue of Hedin's equations and the GW Approximation (GWA) is constructed. LÄS MER