Sökning: "Heterostructure"

Visar resultat 1 - 5 av 20 uppsatser innehållade ordet Heterostructure.

  1. 1. Modelling of injection of electrons by low-dimensional nanowire into a reservoir

    Master-uppsats, Linköpings universitet/Teoretisk Fysik

    Författare :Ivan Yakymenko; [2018]
    Nyckelord :quantum wire; magnetic electron focusing; electron flow; electron injector and detector; semiconductor heterostructure; two-dimensional electron gas;

    Sammanfattning : High-mobility two-dimensional electron gas (2DEG) which resides at the interface between GaAs and AlGaAs layered semiconductors has been used experimentally and theoretically to study ballistic electron transport. The present project is motivated by recent experiments in magnetic electron focusing. LÄS MER

  2. 2. Electrical characterization of strained InP-Ga(x)In(1-x)As core-shell nanowires

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

    Författare :Lorenz Frevel; [2016]
    Nyckelord :nanowire; strain; piezoelectric effect; indium phosphide; InP; gallium indium arsenide; GaInAs; InGaAs; core-shell; radial heterostructure; Physics and Astronomy;

    Sammanfattning : This project report attempts to measure the piezoelectric effect in strained core-shell nanowires. The core material is wurtzite indium phosphide (InP) and the shell material wurtzite gallium indium arsenide (Ga(x)In(1-x)As). LÄS MER

  3. 3. A Study of Atomic Diffusion from First Principles Theory

    Master-uppsats, Uppsala universitet/Materialteori

    Författare :Raquel Esteban Puyuelo; [2016]
    Nyckelord :;

    Sammanfattning : In this work Density Functional Theory and the Nudged Elastic Band method are used to calculate energy barriers to study atomic diffusion. Diffusion is one of the processes that leads to non ideal experimental conditions such as defects or not sharp enough interfaces. LÄS MER

  4. 4. Modelling of Electron Transport in Thermoelectric Devices based on Semiconductor Heterostructures

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

    Författare :Klara Courteaut; [2016]
    Nyckelord :Transfer matrix; Superlattices; Nanotechnology; Electron transport; Heterostructures; Thermoelectrics; Physics and Astronomy;

    Sammanfattning : The electron transmission probability in semiconductor heterostructures made of potential barriers whose height, width and separation are modified to follow different Gaussian functions are calculated using the transfer matrix theory. These structures then serve as electron obstacles in thermoelectric devices in order to increase the output power and efficiency. LÄS MER

  5. 5. Effects of geometry on electronstates in semiconductor quantumpoint contacts

    Master-uppsats, Linköpings universitet/Institutionen för fysik, kemi och biologi

    Författare :Rasmus Hytter; [2016]
    Nyckelord :;

    Sammanfattning : Recent preliminary experiments appear to show that using the electron-electron interaction as a way to filter electrons through a quantum point contact (QPC) according to spin might be possible. The same experiments also show that the geometry of the constriction has an effect on the filtering. LÄS MER

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