Search for dissertations about: "Quantum Hall effects"

Showing result 1 - 5 of 19 swedish dissertations containing the words Quantum Hall effects.

  2. 1. Effects of future climate on carbon assimilation of boreal Norway spruce

    Author : Marianne Hall; Göteborgs universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; bud development; climate change; empirical models; gas exchange; photosynthesis; Picea abies; seasonality; whole-tree chambers;

    Abstract : In boreal forests, the main factors limiting biomass production are the harsh climate, which combines a short growing season and low annual levels of incoming solar energy, and the limited availabilit... mery of nitrogen. READ MORE

  4. 2. Quasiparticles in the Quantum Hall Effect

    Author : Janik Kailasvuori; Thors Hans Hansson; Jan Myrheim; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; quantum Hall effect; quasiparticles; noncommutative Chern-Simons theory; nonabelian statistics; thin torus; p-wave superconductivity; topology; index theory; effective gauge fields; Condensed matter physics; Kondenserade materiens fysik;

    Abstract : The fractional quantum Hall effect (FQHE), discovered in 1982 in a two-dimensional electron system, has generated a wealth of successful theory and new concepts in condensed matter physics, but is still not fully understood. The possibility of having nonabelian quasiparticle statistics has recently attracted attention on purely theoretical grounds but also because of its potential applications in topologically protected quantum computing. READ MORE

  5. 3. Interactions on the edge of a quantum spin Hall insulator

    Author : Anders Ström; Göteborgs universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; topological insulators; quantum spin Hall effect; low-dimensional physics; bosonization; renormalization group;

    Abstract : Effects from electron-electron interactions on the edge of a quantum spin Hall insulator are studied using bosonisation and renormalisation group methods. First, a quantum spin Hall device with a point contact connecting two of its edges is considered. READ MORE

  6. 4. Geometry, Topology and Emergence in Moiré Systems

    Author : Ahmed Abouelkomsan; Emil Johansson Bergholtz; Felix von Oppen; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Moiré materials; Topological phases; Fractional Chern insulators; Quantum geometry; Quantum Hall effects; Theoretical Physics; teoretisk fysik;

    Abstract : The experimental discovery of correlated insulators and superconductivity in highly tunable Van der Waals heterostructures, such as twisted bilayer graphene, has highlighted the role of moiré patterns, resulting from tiny relative twists or lattice constant mismatches, in realizing strongly correlated physics. A key ingredient is the existence of very narrow flat bands where interaction effects are dominant. READ MORE

  7. 5. III-V Devices for Emerging Electronic Applications

    Author : Patrik Olausson; NanoLund: Centre for Nanoscience; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Cryogenic; Hall; III-V; InAs; InGaAs; Josephson junction; Magnetoresistance; MOSFET; Nanowire; Quantum well; Superconductivity; Template-assisted selective epitaxy; Cryogenic; Hall; III-V; InAs; InGaAs; Josephson junction; Magnetoresistance; MOSFET; Nanowire; Quantum well; Superconductivity; Template-assisted selective epitaxy;

    Abstract : Today’s digitalized society relies on the advancement of silicon (Si) Complementary Metal Oxide Semiconductor (CMOS) technology, but the limitations of down-scaling and the rapidly increasing demand for added functionality that is not easily achieved in Si, have pushed efforts to monolithically 3D-integrate III-V devices above the Si-CMOS technology. In addition, the demand for increased computational power and handling of vast amounts of data is rapidly increasing. READ MORE