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Circular dichroism in cavities coupled to ferromagnetic metals and superconductors
Høydalsvik, Eirik Jaccheri (Master thesis, 2023)I denne masteroppgaven undersøker vi muligheten for å bruke sirkulært polarisert lys i elektromagnetiske kaviteter for å studere superledere og ferromagnetiske metaller. En elektromagnetisk kavitet er et lukket område med ... -
Diffusive Curved Superconductor-Ferromagnet Proximity Systems in and out of Equilibrium
Skarpeid, Alv Johan (Master thesis, 2022)I strukturer med superledere og ferromagneter kan superledende korrelasjoner lekke et lite stykke inn i ferromagneten; dette er den superledende proksimitetseffekten. Hybridsystemer hvor denne effekten er signifikant kan ... -
Inverse proximity effect in s-wave and d-wave superconductors coupled to topological insulators
Hugdal, Henning Goa; Amundsen, Morten; Linder, Jacob; Sudbø, Asle (Journal article; Peer reviewed, 2019)We study the inverse proximity effect in a bilayer consisting of a thin s- or d-wave superconductor (S) and a topological insulator (TI). Integrating out the topological fermions of the TI, we find that spin-orbit coupling ... -
Possible odd-frequency Amperean magnon-mediated superconductivity in topological insulator–ferromagnetic insulator bilayer
Hugdal, Henning Goa; Sudbø, Asle (Journal article; Peer reviewed, 2020)We study the magnon-mediated pairing between fermions on the surface of a topological insulator (TI) coupled to a ferromagnetic insulator with a tilted mean field magnetization. Tilting the magnetization toward the interfacial ... -
Quasiclassical Theory for Dirac Material/Superconductor Proximity Structures
Hugdal, Henning Goa (Master thesis, 2016)In the decade since the experimental discovery of graphene and the topological insulators, the field of Dirac materials, a new class of materials with linear low-energy dispersions, has attracted great research interest. ... -
Quasiclassical theory for the superconducting proximity effect in Dirac materials
Hugdal, Henning Goa; Linder, Jacob; Jacobsen, Sol (Journal article, 2017)We derive the quasiclassical non-equilibrium Eilenberger and Usadel equations to first order in quantities small compared to the Fermi energy, valid for Dirac edge and surface electrons with spin-momentum locking p· σ¯, ... -
A study of proximity-induced and magnon-mediated superconductivity on the surface of topological insulators
Hugdal, Henning Goa (Doctoral theses at NTNU;2021:40, Doctoral thesis, 2020)Summary: This thesis presents a study of superconducting phases in different effectively two-dimensional (2D) systems with spin-orbit coupling, with particular emphasis on systems consisting topological insulators (TIs) ... -
Vortex spin valve on a topological insulator
Amundsen, Morten; Hugdal, Henning Goa; Sudbø, Asle; Linder, Jacob (Journal article; Peer reviewed, 2018)Spin-valve structures are usually associated with the ability to modify the resistance of electrical currents. We here demonstrate a profoundly different effect of a spin-valve. In combination with a topological insulator ...