Blar i NTNU Open på forfatter "Sudbø, Asle"
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Enhancement of superconductivity mediated by antiferromagnetic squeezed magnons
Erlandsen, Eirik; Kamra, Akashdeep; Brataas, Arne; Sudbø, Asle (Journal article; Peer reviewed, 2019)We theoretically investigate magnon-mediated superconductivity in a heterostructure consisting of a normal metal and a two-sublattice antiferromagnetic insulator. The attractive electron-electron pairing interaction is ... -
Exceeding the Chandrasekhar-Clogston limit in flat-band superconductors: A multiband strong-coupling approach
Mæland, Kristian; Sudbø, Asle (Peer reviewed; Journal article, 2023)Hybrid systems of superconductors and magnets display several intriguing properties, both from a fundamental physics point of view and with practical applications. Promising applications in superconducting spintronics ... -
Excitation Spectrum and Superfluidity of Weakly Interacting, Spin-Orbit Coupled Bose-Einstein Condensate
Mæland, Kristian (Master thesis, 2020)En svakt vekselvirkende, spinn-bane koblet, to-komponent, ultrakald Bose-gass bundet til et Bravais gitter blir studert. En analytisk framgangsmåte for å beskrive slike systemer i superfluid regimet blir presentert, motivert ... -
Fingerprints of Universal Spin-Stiffness Jump in Two-Dimensional Ferromagnets
Troncoso, Roberto; Brataas, Arne; Sudbø, Asle (Peer reviewed; Journal article, 2020)Motivated by recent progress on synthesizing two-dimensional magnetic van der Waals systems, we propose a setup for detecting the topological Berezinskii-Kosterlitz-Thouless phase transition in spintransport experiments ... -
First-order superconducting phase transition in a chiral p+ip system
Haugen, Håvard Homleid; Krohg, Fredrik Nicolai; Babaev, Egor; Sudbø, Asle (Peer reviewed; Journal article, 2021)We use large-scale Monte Carlo computations to study the phase transitions between a two-component chiral p -wave superconductor and normal state in zero external magnetic field. We find a first-order phase transition from ... -
Ginzburg-Landau Theory for Charge Density Waves and Superconductivity
Ekrheim, Stine; Roheim, Marthe Elise Fiskerstrand (Master thesis, 2023)Motivert av den økende interessen for Cuprate-høytemperatur-superledere, tar denne oppgaven for seg samspillet mellom to av dens symmetribrytende faser, superledning og ladningstetthetsbølger. Fra en mikroskopisk teori ... -
Ginzburg-Landau Theory for Charge Density Waves and Superconductivity
Ekrheim, Stine; Roheim, Marthe Elise Fiskerstrand (Master thesis, 2023)Motivert av den økende interessen for Cuprate-høytemperatur-superledere, tar denne oppgaven for seg samspillet mellom to av dens symmetribrytende faser, superledning og ladningstetthetsbølger. Fra en mikroskopisk teori ... -
Going beyond the Chandrasekhar-Clogston limit in a flatband superconductor
Ghanbari Birgani, Atousa; Erlandsen, Eirik; Sudbø, Asle; Linder, Jacob (Peer reviewed; Journal article, 2022)The Chandrasekhar-Clogston limit normally places stringent conditions on the magnitude of the magnetic field that can coexist with spin-singlet superconductivity, restricting the critical induced Zeeman shift to a fraction ... -
Interfacial magnon-mediated superconductivity in twisted bilayer graphene
Brekke, Bjørnulf; Sudbø, Asle; Brataas, Arne (Journal article; Peer reviewed, 2024)The interfacial coupling between electrons and magnons in adjacent layers can mediate an attractive electron–electron interaction and induce superconductivity. We consider magic-angle twisted bilayer graphene sandwiched ... -
Interplay between superconductivity and ferromagnetism on a topological insulator
Linder, Jacob; Tanaka, Yukio; Yokoyama, Takehito; Sudbø, Asle; Nagaosa, Naoto (Journal article; Peer reviewed, 2010)We study theoretically proximity-induced superconductivity and ferromagnetism on the surface of a topological insulator. In particular, we investigate how the Andreev-bound states are influenced by the interplay between ... -
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 ... -
Investigating the excitation spectrum of a spin-orbit coupled Bose-Einstein condensate
Solli, Sigve (Master thesis, 2017)The excitation spectrum of a spin-orbit coupled Bose-Einstein condensate is investigated by the use of the Bose-Hubbard model and a mean-field approach. The undiagonalized Hamiltonian matrix for a general inversion-symmetric ... -
Josephson effect in S/F/S junctions: Spin bandwidth asymmetry versus Stoner exchange
Annunziata, Gaetano; Enoksen, Henrik; Linder, Jacob; Cuoco, Mario; Noce, Canio; Sudbø, Asle (Journal article; Peer reviewed, 2011)We analyze the dc Josephson effect in a ballistic superconductor/ferromagnet/superconductor junction by means of the Bogoliubov–de Gennes equations in the quasiclassical Andreev approximation. We consider the possibility ... -
Local versus Equal Load Sharing in the Fiber Bundle Model
Kjellstadli, Jonas Tøgersen (Doctoral theses at NTNU;2019:368, Doctoral thesis, 2019)Fracture is a huge field of research that includes physics, geology, materials science, and engineering. Most approaches are very specialized, but what if we instead want to focus on the big picture to look for general ... -
Magnon drag in a metal–insulating antiferromagnet bilayer
Erlandsen, Eirik; Sudbø, Asle (Peer reviewed; Journal article, 2022)We study a bilayer structure consisting of an antiferromagnetic insulator and a normal metal. An electron current is driven in the normal metal with direction parallel to the interface between the materials. Due to interfacial ... -
Magnon-mediated superconductivity and other collective phenomena in heterostructures of magnets and conductors
Erlandsen, Eirik (Doctoral theses at NTNU;2022:269, Doctoral thesis, 2022)Sammendrag: Superledning fra magnetisme Når ulike typer materialer kobles sammen, kan deres egenskaper bli påvirket av hverandre. Spesielt i nærheten av overflaten mellom to ulike materialer, kan nye ting skje. ... -
Magnon-mediated superconductivity on the surface of a topological insulator
Erlandsen, Eirik; Brataas, Arne; Sudbø, Asle (Journal article; Peer reviewed, 2020)We study superconductivity on the surface of a topological insulator, mediated by magnetic fluctuations in an adjacent ferromagnetic or antiferromagnetic insulator. Superconductivity can arise from effective interactions ... -
Magnon-Mediated Superconductivity: Investigating the Emergence of Strong Topological Superconductivity Mediated by Magnons in a Coplanar, Non-Collinear Magnet
Abnar, Sara (Master thesis, 2023)Denne masteroppgaven undersøker hvorvidt topologisk superledning kan oppstå i et todimensjonalt system bestående av et normalmetall og en magnet med koplanær spinnfase. Vi bygger videre på arbeidet til Mæland og Sudbø [1], ... -
Majorana fermions manifested as interface states in semiconductor hybrid structures
Linder, Jacob; Sudbø, Asle (Journal article; Peer reviewed, 2010)Motivated by recent proposals for the generation of Majorana fermions in semiconducting hybrid structures, we examine possible experimental fingerprints of such excitations. Whereas previous works mainly have focused on ... -
Manipulating superconductivity in magnetic nanostructures in and out of equilibrium
Ouassou, Jabir Ali (Doctoral theses at NTNU;2019:57, Doctoral thesis, 2019)We consider nanostructures that are constructed from superconducting, ferromagnetic, and spin–orbit-coupled materials. These structures are analyzed both theoretically and numerically, under both equilibrium and nonequilibrium ...