Sökning: "exact diagonalization"

Hittade 5 uppsatser innehållade orden exact diagonalization.

  1. 1. Real-time Entanglement of Auger and XPS-electrons: a preliminary investigation

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

    Författare :Philip Johansson; [2019]
    Nyckelord :Entanglement; Auger; Auger decay; photoemission; XPS; ED; exact diagonalization; Physics and Astronomy;

    Sammanfattning : In this work, we employ a semi-classical approach to light matter interaction to describe and char- acterize spin configurations resulting from quantum correlations between electrons created by a photoemission event and by the following Auger decay. The system studied consists of three atomic levels and two continua. LÄS MER

  2. 2. Theory and Modeling of Electrical Control of Chiral Qubit in Spin-Frustrated Molecular Triangle

    Magister-uppsats, Linnéuniversitetet/Institutionen för fysik och elektroteknik (IFE)

    Författare :Shirin Hakimi; [2019]
    Nyckelord :quantum computers; spinfrustration;

    Sammanfattning : Spin-frustrated molecular triangles have four low-lying energy states, so called chiral states, which can be employed as the unit of information, qubit, in a quantum computer. The fact that the chiral states are characterized by two quantum numbers chirality and spin allows the control of the magnetization of the molecule by an electric field due to the spin-electric interaction. LÄS MER

  3. 3. Exact Solutions of the Ising Model

    Kandidat-uppsats, Uppsala universitet/Teoretisk astrofysik

    Författare :Ludwig Ridderstolpe; [2017]
    Nyckelord :ising; ising model; square-lattice ising model; transfer matrix;

    Sammanfattning : This report presents the general Ising model and its basic assumptions. This study aims to, from diagonalization of the Transfer Matrix, obtain the Helmholtz free energy and the exclusion of a phase transition for the one-dimensional Ising model under an external magnetic field. LÄS MER

  4. 4. Magnetization dynamics in nanorings

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

    Författare :Simon Ydman; [2015]
    Nyckelord :Kondo effect; quantum rings; doniach phase diagram; exact diagonalization; Physics and Astronomy;

    Sammanfattning : This thesis investigates numerically the out of equilibrium properties of quantum rings with magnetic impurities, using the periodic Anderson model (PAM). The model is a simple template for the discussion of the physics of regular arrays of rare-earth impurities in metallic hosts. LÄS MER

  5. 5. Exact Diagonalization of Few-electron Quantum Dots

    Kandidat-uppsats, Linnéuniversitetet/Institutionen för datavetenskap, fysik och matematik, DFM

    Författare :Shirin Hakimi; [2009]
    Nyckelord :two-dimensional quantum dot; strongly correlated system; few-electron system; exact diagonalization; Lanczos method; Landau level; fractional quantum Hall effect; Wigner crystal; Hartree-Fock approximation; Second quantization;

    Sammanfattning : We consider a system of few electrons trapped in a two-dimensional circularquantum dot with harmonic confinement and in the presence of ahomogeneous magnetic field, with focus on the role of e-e interaction. Byperforming the exact diagonalization of the Hamiltonian in second quantization,the low-lying energy levels for spin polarized system are obtained. LÄS MER