Sökning: "topologiska isolatorer"

Visar resultat 1 - 5 av 6 uppsatser innehållade orden topologiska isolatorer.

1. 1. Quantum Transport in Topological Insulator Nanowires

   Master-uppsats, KTH/Fysik

   Författare :Sergi Pradas Rodriguez; [2023]
   Nyckelord :quantum transport; topological insulators; nanowires; numerical analysis; Kwant; etc.; kvanttransport; topologiska isolatorer; nanotrådar; numerisk analys; Kvant; etc.;

   Sammanfattning : Three-dimensional topological insulators are materials that have a bulk band gap like a traditional insulator, but which hold topologically protected conducting surface states. In this thesis we present a numerical analysis of the surface states of topological insulator nanowires in the tight-binding approximation. LÄS MER

3. 2. 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

4. 3. Topological properties of flat bands in generalized Kagome lattice materials

   Master-uppsats, KTH/Fysik

   Författare :Daniela Pinto Dias; [2021]
   Nyckelord :tight-binding; topological insulators; flat bands; edge states; honeycomb-Kagome lattice; tätt bindande modell; topologiska isolatorer; platta band; kanttillstånder; bikakan-Kagome gitter;

   Sammanfattning : Topological insulators are electronic materials that behave like an ordinary insulator in their bulk but have robust conducting states on their edge. Besides, in some materials the band structure presents completely flat bands, a special feature leading to strong interactions effects. LÄS MER

5. 4. Band structures of topological crystalline insulators

   Master-uppsats, Karlstads universitet/Institutionen för ingenjörsvetenskap och fysik

   Författare :Elisabet Edvardsson; [2018]
   Nyckelord :Topological insulator; Band structure; Block tridiagonal matrix;

   Sammanfattning : Topological insulators and topological crystalline insulators are materials that have a bulk band structure that is gapped, but that also have toplogically protected non-gapped surface states. This implies that the bulk is insulating, but that the material can conduct electricity on some of its surfaces. LÄS MER

7. 5. Axion Electrodynamics and Measurable Effects in Topological Insulators

   Master-uppsats, Karlstads universitet/Fakulteten för hälsa, natur- och teknikvetenskap (from 2013)

   Författare :Andreas Asker; [2018]
   Nyckelord :Topological Insulators; Axion Electrodynamics; Topological Magnetoelectric Effect; Topological Field Theory; Faraday-Kerr Effect; Topologiska Isolatorer; Axion Elektrodynamik; Topologiska Magnetoelektriska Effekten; Topologisk Fältteori; Faraday-Kerr Effekten;

   Sammanfattning : Topological insulators are materials with their electronic band structure in bulk resembling that of an ordinary insulator, but the surface states are metallic. These surface states are topologically protected, meaning that they are robust against impurities. LÄS MER