Sökning: "electron localization"

Hittade 4 uppsatser innehållade orden electron localization.

  1. 1. Localized and extended states in finite-sized mosaic Wannier-Stark lattices

    Master-uppsats, KTH/Tillämpad fysik

    Författare :Emrah Tortumlu; [2023]
    Nyckelord :Applied Physics; Condensed matter physics; quantum technology; quantum nanophotonics; localization; mobility edge; phase transition; Tillämpad Fysik; Kondenserade materiens fysik; kvantteknologi; kvantnanofotonik; lokalisering; fasövergång;

    Sammanfattning : Anderson localization occurs when an otherwise conductive solid becomes insulatingdue to a sufficiently large degree of disorder in the medium. The electron band energy(as a function of disorder) at which this transition between extended and localizedelectron states occur is called the mobility edge (ME) and is energy-dependent only in3-dimensional systems. LÄS MER

  3. 2. Study of hole mobility in amorphous polyethylene via kinetic Monte Carlo methods

    Master-uppsats, KTH/Matematik (Avd.)

    Författare :Hannes Aspåker; [2022]
    Nyckelord :;

    Sammanfattning : This thesis presents a study of hole mobility in amorphous polyethylene using kinetic Monte Carlo (KMC) methods together with a novel chain segmentation model developed by Unge and Nilsson, which determines hole localization sites based on torsion angles along the polymer chain. An extension to the KMC algorithm was developed which improves performance by modelinground-trips between strongly interconnected localization sites. LÄS MER

  4. 3. Investigating the GW self-energy of the homogeneous electron gas in real space

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

    Författare :Zhen Zhao; [2018]
    Nyckelord :GW method; self energy; screened-exchange; Coulomb-hole; Physics and Astronomy;

    Sammanfattning : The real space behavior of the GW self-energy in the electron gas model was investigated in this thesis work. The self-energy is naturally decomposed into the screened-exchange and the Coulomb-hole components. LÄS MER

  5. 4. Elektronlokalisering och spinpolarisation i en kvantcirkel

    Master-uppsats, Institutionen för fysik, kemi och biologi

    Författare :Erik Welander; [2009]
    Nyckelord :Spin polarization; electron localization;

    Sammanfattning : Localization and magnetic properties of electrons in a thin, cyclic quasi one-dimensional GaAs wire with a central potential barrier were studied using the Hartree-Fock and LSDA (Local Spin Density Approximation, exchange only) and compared to more time consuming Quantum Monte-Carlo calculations. Within LSDA, evidence of true localization was found as well as evidence for the existence of both ferromagnetic as well as anti-ferromagnetic states. LÄS MER