Sökning: "2DEG"

Hittade 5 uppsatser innehållade ordet 2DEG.

  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

  3. 2. 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

  4. 3. Spin-FET based on InGaAs/InP heterostructure

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

    Författare :Ricardo Moreira Salles De Andrade; [2011]
    Nyckelord :Spin; Spintronics; Field-effect transistor; Datta-Das transistor; Rashba effect; Low-temperature.; Physics and Astronomy;

    Sammanfattning : A new design based on the spinFET proposed by Datta-Das was fabricated, using a channel defined by etching on a 2DEG material and nanomagnets as top-gates. The magnetotransports properties were measured at low temperatures. LÄS MER

  5. 4. Electron transport in quantum point contacts : A theoretical study

    Magister-uppsats, Institutionen för datavetenskap, fysik och matematik, DFM

    Författare :Alexander Gustafsson; [2011]
    Nyckelord :quantum point contact; mesoscopic physics; 2DEG; quantized conductance; Aharonov-Bohm; magnetoconductance; recursive Green s function; quantum Hall effect;

    Sammanfattning : Electron transport in mesoscopic systems, such as quantum point contacts and Aharonov-Bohm rings are investigated numerically in a tight-binding language with a recursive Green's function algorithm. The simulation reveals among other things the quantized nature of the conductance in point contacts, the Hall conductance, the decreasing sensitivity to scattering impurities in a magnetic field, and the periodic magnetoconductance in an Aharonov-Bohm ring. LÄS MER

  7. 5. Characterization of AlGaN HEMT structures

    Uppsats för yrkesexamina på grundnivå, Institutionen för fysik, kemi och biologi

    Författare :Anders Lundskog; [2007]
    Nyckelord :HEMT; Hot-Wall MOCVD; GaN; AlGaN; AlN exclusionlayer; Double heterojunction; 1D Poisson-Schrödinger;

    Sammanfattning : During the last decade, AlGaN High Electron Mobility Transistors (HEMTs) have been intensively studied because their fundamental electrical properties make them attractive for highpower microwave device applications. Despite much progress, AlGaN HEMTs are far from fully understood and judged by the number of published papers the understanding of advanced structures is even poorer. LÄS MER