Sökning: "Heterostructure"

Visar resultat 11 - 15 av 24 uppsatser innehållade ordet Heterostructure.

  1. 11. Electron Assisted Growth of h-BN on Gr/Ir(111)

    Master-uppsats, Lunds universitet/Synkrotronljusfysik; Lunds universitet/Fysiska institutionen

    Författare :Virginia Boix De La Cruz; [2018]
    Nyckelord :Two-dimension materials; 2D; Graphene; hexagonal Boron Nitride; Growth; CVD; STM; XPS; Physics and Astronomy;

    Sammanfattning : Stacked heterostructures of two-dimensional (2D) materials are emerging as promising building blocks for a wide range of applications. These devices, which range from tunneling transistors to light-emitting diodes, use the properties of 2D materials that are not accessible by their bulk counterparts. LÄS MER

  3. 12. 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

  4. 13. 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

  5. 14. 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

  7. 15. Quantized Transmission in an Asymmetrically Biased Quantum Point Contact

    Master-uppsats, Linköpings universitet/Teoretisk Fysik

    Författare :Erik Johansson; [2016]
    Nyckelord :;

    Sammanfattning : In this project work we have studied how a two-dimensional electron gas (2DEG) in a GaAs/AlGaAs semiconductor heterostructure can be locally confined down to a narrow bottleneck constriction called a quantum point contact (QPC) and form an artificial quantum wire using a split-gate technique by application of negative bias voltages. The electron transport through the QPC and how asymmetric loading of bias voltages affects the nature of quantized conductance were studied. LÄS MER