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Hittade 3 uppsatser som matchar ovanstående sökkriterier.

  1. 1. Higher Forms and Dimensional Hierarchy in Topological Condensed Matter

    Master-uppsats, KTH/Fysik

    Författare :Yashar Honarmandi; [2022]
    Nyckelord :Theoretical physics; topological quantum matter; parametrized systems; Berry phase; higher Berry curvature; effective field theory; topological action; topological insulators; dimensional hierarchy; Teoretisk fysik; topologisk kvantmateria; parametriserade system; Berryfas; högre Berrykrökning; effektiv fältteori; topologisk verkan; topologiska isolatorer; dimensionshierarki;

    Sammanfattning : This report discusses higher differential forms with applications in the study of topological phenomena. The integer quantum Hall effect is first discussed, demonstrating a connection between models on a lattice and quantum field theories bridged by a topological invariant, namely the Chern number. LÄS MER

  3. 2. Val och implementering av en varvtalssensor i växellådan på ett elektrifierat bandvagn

    Uppsats för yrkesexamina på grundnivå, Umeå universitet/Institutionen för tillämpad fysik och elektronik

    Författare :Philip Eriksson; Erik Sandberg; [2021]
    Nyckelord :Bandwagon; Sensor; Hall effect; Eddy current; Bandvagn; Sensor; Halleffekt; Virvelström; CAD;

    Sammanfattning : This project was carried out in cooperation with the company BAE Systems Hägglunds AB in Örnsköldsvik, which produces vehicles for military as well as civil use. There is an ongoing project at BAE researching bandwagons using electricity as their source of energy, codename SIRIUS, and this investigation is part of it. LÄS MER

  4. 3. From the quantum Hall effect to topological insulators : A theoretical overview of recent fundamental developments in condensed matter physics

    Kandidat-uppsats, Teoretisk fysik

    Författare :Hjalmar Eriksson; [2010]
    Nyckelord :quantum Hall effect; topological insulator; topological insulators; Hall effect; quantum spin Hall effect; kvantiserade Halleffekten; topologisk isolator; topologiska isolatorer; Halleffekten; kvantiserade spin-Halleffekten;

    Sammanfattning : In this overview I describe the simplest models for the quantum Hall and quantum spin Hall effects, and give some general indications as to the description of topological insulators. As a background to the theoretical models I will first trace the development leading up to the description of topological insulators . LÄS MER