Essays about: "quantized conductance"

Found 4 essays containing the words quantized conductance.

  1. 1. Benchtop conductance quantization

    University essay from Linnéuniversitetet/Institutionen för fysik och elektroteknik (IFE)

    Author : Markus Andersson; [2023]
    Keywords : Conductivity;

    Abstract : Quantum conductance is a phenomenon associated with nanowires / quantum point contacts where the current through a wire is quantized. Experiments have shown that this phenomenon can be manifested at room temperature using macroscopic wires. This project is aimed to recreate these experiments with emphasis on simplicity. READ MORE

  3. 2. Quantized Transmission in an Asymmetrically Biased Quantum Point Contact

    University essay from Linköpings universitet/Teoretisk Fysik

    Author : Erik Johansson; [2016]
    Keywords : ;

    Abstract : 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. READ MORE

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

    University essay from Institutionen för datavetenskap, fysik och matematik, DFM

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

    Abstract : 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. READ MORE

  5. 4. Quantum point contact : A theoretical study

    University essay from Matematiska och systemtekniska institutionen

    Author : Alexander Gustafsson; [2010]
    Keywords : quantum point contact; transmission; conduction; Green s functions;

    Abstract : Experiments shows that the conductance of a quantum point contact is quantized in steps of  2e²/h, where e is the charge of the electron and h is Planck’s constant, and thereby Ohm’s law is not valid for nanostructures. By using the approximation method finite difference, the transmission for one-dimensional contacts and one- and two-dimensional potentials are investigated. READ MORE