Essays about: "Kwant"

Found 4 essays containing the word Kwant.

  1. 1. Quantum Transport in Topological Insulator Nanowires

    University essay from KTH/Fysik

    Author : Sergi Pradas Rodriguez; [2023]
    Keywords : quantum transport; topological insulators; nanowires; numerical analysis; Kwant; etc.; kvanttransport; topologiska isolatorer; nanotrådar; numerisk analys; Kvant; etc.;

    Abstract : Three-dimensional topological insulators are materials that have a bulk band gap like a traditional insulator, but which hold topologically protected conducting surface states. In this thesis we present a numerical analysis of the surface states of topological insulator nanowires in the tight-binding approximation. READ MORE

  3. 2. Simulating the effect of structural imperfections on nanowire transport properties using kwant

    University essay from Lunds universitet/Matematisk fysik; Lunds universitet/Fysiska institutionen

    Author : Alexandros Pallaris; [2021]
    Keywords : nanowire; conductance; imperfection; electron transport; quantum transport; tight-binding model; Technology and Engineering;

    Abstract : Conductance was calculated for trapezoidal nanowires with different forms and strengths of imperfection using kwant, a quantum transport software package that uses a tight-binding model. In this thesis it is found that increasing magnitudes of different imperfections such as surface charge and roughness roughen conductance steps, introduce resonances, and lower conductance overall with different character of these effects for different types of imperfections. READ MORE

  4. 3. Electronic states in semiconductor double quantum dots and quantum rings - Theory and tight-binding modeling

    University essay from Lunds universitet/Fasta tillståndets fysik; Lunds universitet/Fysiska institutionen

    Author : Calle Stenberg; [2021]
    Keywords : double quantum dots quantum rings tight-binding aharonov-bohm g-factor enhancement InAs; Physics and Astronomy;

    Abstract : In recent experiments on semiconductor nanowires and quantum dots, enhanced g-factors up to several times the bulk value have been measured [1] [2]. The enhancement is attributed to orbital contributions g∗orb to the effective g-factor g∗ = g∗spin+g∗orb from the coupling of the high angular momentum ring-like states to the magnetic field. READ MORE

  5. 4. Numerical simulations of contact geometry effects on transport properties of semiconductor nanowires

    University essay from Lunds universitet/Matematisk fysik; Lunds universitet/Fysiska institutionen

    Author : Emil Johansson; [2016]
    Keywords : transport; nanowires; kwant; contacts; Physics and Astronomy;

    Abstract : .... READ MORE