Sökning: "electron holes"

Visar resultat 6 - 10 av 20 uppsatser innehållade orden electron holes.

  1. 6. Mass-Singularity Structure of QED and Perturbative Quantum Gravity Scatterings

    Kandidat-uppsats, Lunds universitet/Teoretisk partikelfysik - Geonomgår omorganisation

    Författare :Santiago Londono Castillo; [2020]
    Nyckelord :perturbative quantum gravity; QED; mass singularities; collinear singularities; soft singularities; singularity cancellation; graviton; Physics and Astronomy;

    Sammanfattning : In this thesis, the mass singularities occurring in the cross-section of electron scattering processes are investigated. Two types of scatterings are studied: Quantum Electrodynamics (QED) scatterings, and Perturbative Quantum Gravity (PQG) scatterings. LÄS MER

  3. 7. Gap properties of helical edge states in two-dimensional topological insulators with time-dependent magnetic impurities

    Master-uppsats, Lunds universitet/Fasta tillståndets fysik; Lunds universitet/Fysiska institutionen

    Författare :Simon Wozny; [2020]
    Nyckelord :topological insulators; edge states; impurities; density of states; Green s function; Floquet; Physics and Astronomy;

    Sammanfattning : The quantum mechanical equivalent of the classical Hall effect can lead to interesting results in solid state physics. A similar effect, that has received attention in recent years, occurs when large spin-orbit coupling is present in a material, the so-called quantum-spin Hall effect. LÄS MER

  4. 8. Plasma density characteristics of magnetic holes near the Kronian magnetosphere boundary surfaces

    Master-uppsats, Uppsala universitet/Institutionen för fysik och astronomi

    Författare :Marlon Luis Bause; [2020]
    Nyckelord :Magnetic holes; Saturn; Langmuir Probe; plasma electron density; Magnetosphere;

    Sammanfattning : Localized structures of the magnetic field strength depression are often observed in the interplanetarymedium, and they are called ‘magnetic holes’ after the original work of Turner et al. 1977. A numberof observations of similar features have been reported, while the mechanisms of their origin have notfully understood yet. LÄS MER

  5. 9. Mechanical properties of SiC nanowires with polytypes

    Master-uppsats, Lunds universitet/Fasta tillståndets fysik; Lunds universitet/Fysiska institutionen

    Författare :Anders Vesti; [2019]
    Nyckelord :atomistic modeling; nanowires; molecular dynamics; simulation; SiC; silicon carbide; fracture behavior; nanomechanics; Physics and Astronomy;

    Sammanfattning : In this report, we model the mechanical properties and fracture behavior of SiC nanowires with different polytypes using Molecular Dynamics (MD) simulations. The mechanical properties investigated are the Young’s modulus, the maximum tensile stress and the fracture strain. The three polytype tested are SiC (3C), (2H) and (4H). LÄS MER

  7. 10. Correlated Structure-Property Investigation of Ultrathin InAs Nanowires

    Master-uppsats, Lunds universitet/Fasta tillståndets fysik; Lunds universitet/Fysiska institutionen

    Författare :Linnea Suomenniemi; [2019]
    Nyckelord :Nanowires; InAs; epitaxy; MBE; Photo luminescence; Physics and Astronomy;

    Sammanfattning : III-V semiconductors are a profound part of the optoelectronics industry and new developments in alloy compositions and architectures are constantly emerging. Lowdimensional semiconductors, such as nanowires (NWs) have shown to have improved characteristics in certain areas such as enhanced light absorption and can furthermore be integrated on Silicon (Si) plattforms and are thus predicted to be a key component in future nanoelectronic and nanophotonic applications and devices. LÄS MER