Blar i NTNU Open på forfatter "Sudbø, Asle"
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Signature of odd-frequency pairing correlations induced by a magnetic interface
Linder, Jacob; Sudbø, Asle; Yokoyama, Takehito; Grein, Roland; Eschrig, Matthias (Journal article; Peer reviewed, 2010)We investigate the mutual proximity effect in a normal metal contacted to a superconductor through a magnetic interface. Analytical and self-consistent numerical results are presented, and we consider both the diffusive ... -
Slave-boson approach to the U=∞ Haldane-Hubbard model
Aase, Niels Henrik (Master thesis, 2021)I denne oppgaven studerer vi Haldane-Hubbard-modellen i grensetilfellet hvor Hubbard-frastøtning går mot uendelig. Fordi superledende ustabiliteter har blitt observert i lignende modeller, er det av spesiell interesse å ... -
Spin-active interfaces and unconventional pairing in half-metal/superconductor junctions
Linder, Jacob; Cuoco, Mario; Sudbø, Asle (Journal article; Peer reviewed, 2010)We study the physical properties of a half-metallic ferromagnet∣superconductor (HM∣S) bilayer, allowing for an arbitrary bulk pairing symmetry of the superconductor and spin-dependent processes at the interface. In particular, ... -
Spin-flip scattering and critical currents in ballistic half-metallic d-wave Josephson junctions
Enoksen, Henrik; Linder, Jacob; Sudbø, Asle (Journal article, 2012)We analyze the dc Josephson effect in a ballistic superconductor/half-metal/superconductor junction by means of the Bogoliubov–de Gennes equations. We study the role of spin-active interfaces and compare how different ... -
Spin-orbit coupled multiband superconductors
Gunnarsen, Gudmund (Master thesis, 2016)A model for square lattice spin orbit coupled cooper pairing is derived using mean field theory. We look at three cases, a magnetic field parallel to the lattice, perpendicular to the lattice, and no magnetic field. For ... -
Spin-polarized Josephson current in superconductor/ferromagnet/superconductor junctions with inhomogeneous magnetization
Alidoust, Mohammad; Linder, Jacob; Rashedi, Gholamreza; Yokoyama, Takehito; Sudbø, Asle (Journal article; Peer reviewed, 2010)We study numerically the properties of spin transport and charge transport in a current-biased nanoscale diffusive superconductor/ferromagnet/superconductor junction when the magnetization texture is nonuniform. Specifically, ... -
Spin-sensitive long-range proximity effect in ferromagnet/spin-triplet-superconductor bilayers
Annunziata, Gaetano; Cuoco, Mario; Noce, Canio; Sudbø, Asle; Linder, Jacob (Journal article; Peer reviewed, 2011)The discovery of noncentrosymmetric superconductors, such as CePt3Si, and chiral superconductors, such as Sr2RuO4, calls for experimental methods to identify the presence of spin-triplet pairing. We here demonstrate a ... -
Stability of superconducting gap symmetries arising from antiferromagnetic magnons
Sun, Chi; Mæland, Kristian; Sudbø, Asle (Peer reviewed; Journal article, 2023)We consider a planar heterostructure consisting of a normal metal in proximity to an antiferromagnetic insulator, with an interlayer exchange coupling between the metal and the insulator. The coupling to the two sublattices ... -
Studies of Ginzburg-Landau theories for two-component chiral superconductors
Krohg, Fredrik Nicolai (Doctoral theses at NTNU;2021:290, Doctoral thesis, 2021)In this thesis we examine theoretical models called Ginzburg-Landau models describing the phenomena of unconventional superconductivity at temperatures close to the transition temperature of superconductivity. Superconductors ... -
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) ... -
Study of the Quasiparticle Excitation Spectrum for the Ultracold, Two-Component, Synthetically Spin-Orbit Coupled, Weakly Interacting Bose Gas Residing on a Bravais Lattice
Halse Rygh, Jonas (Master thesis, 2020)Denne masteroppgaven omhandler studiet av en to-komponent, syntetisk spin-bane koblet, svakt vekselvirkende Bose gass ved ultra kalde temperaturer bundet til et Bravais gitter. Gjennom en middelfeltstilnærming og Bose-Hubbard ... -
Superconductivity in Dirac Materials
Sjømark, Severin Bøyesen (Master thesis, 2016)In this Master s thesis we consider superconductivity in Bravais and bipartite lattice fermion models with nearest neighbour hopping and Rashba-type spin-orbit coupling. The superconductivity is modelled from a negative-U ... -
Superconductivity in the attractive Haldane-Hubbard model
Syed, Shahzeb Talib (Master thesis, 2020)Med nylig økt interesse for vekselvirkende topologiske isolatorer som bakteppe ser vi på superledende egenskaper til en attraktiv Haldane-Hubbard-modell. Haldane-Hubbard-modellen har en faseovergang mellom en Chern-isolator ... -
The Effective U(1)×O(3) Theory of Superconductivity and Antiferromagnetism - Derivation and Critical Properties
Lundemo, Sondre Duna (Master thesis, 2023)Vi utvikler og tar i bruk metoder fra feltteori for å forstå koeksisterende og konkurrerende kvantemekaniske tilstander. Utover en fundamental interesse for ikke-relativistiske kvantefeltteorier med flere spontant brutte ... -
Thermal fluctuations and vortex lattice structures in chiral p-wave superconductors: Robustness of double-quanta vortices
Krohg, Fredrik Nicolai; Haugen, Håvard; Babaev, Egor; Garaud, Julien; Sudbø, Asle (Peer reviewed; Journal article, 2021)We use large-scale Monte-Carlo simulations to study thermal fluctuations in chiral p-wave superconductors in an applied magnetic field in three dimensions. We consider the thermal stability of previously predicted unusual ... -
Thermal remixing of phase-separated states in two-component bosonic condensates
Galteland, Peder Notto; Babaev, Egor; Sudbø, Asle (Journal article; Peer reviewed, 2015)Weconsider a two-component interacting bosonic condensate with dominating intra-species repulsive density–density interactions.Westudy the phase diagram of the system at finite temperature with rotation, using large-scale ... -
Topological field theories of superconductor heterostructures
Bergan, Snorre (Master thesis, 2021)I topologiske materialer, slik som topologisk isolator heterostrukturer, er responsen av et påført elektromagnetisk felt eller magnetisering manifestert ved et såkalt Chern-Simons ledd. Ved å koble et slikt Chern-Simons ... -
Topological superconductivity mediated by magnons of helical magnetic states
Mæland, Kristian; Abnar, Sara; Benestad, Jacob Daniel; Sudbø, Asle (Peer reviewed; Journal article, 2023)We recently showed that spin fluctuations of noncoplanar magnetic states can induce topological superconductivity in an adjacent normal metal [Mæland et al., Phys. Rev. Lett. 130, 156002 (2023)]. The noncolinear nature of ... -
Topological Superconductivity Mediated by Skyrmionic Magnons
Mæland, Kristian; Sudbø, Asle (Peer reviewed; Journal article, 2023)Topological superconductors are associated with the appearance of Majorana bound states, with promising applications in topologically protected quantum computing. In this Letter, we study a system where a skyrmion crystal ... -
Topological Transport Properties of Non-Abelian Magnons in a Spiral Phase Ferromagnetic Insulator
Lind-Olsen, Jesper (Master thesis, 2023)I denne masteroppgaven studerer vi tverrgående topologiske transportegenskaper i en ferromagnetisk insulator med Dzyaloshinskii-Moriya vekselvirkninger i planet. Denne vekselvirkningen er en nøkkelkomponent i å indusere ...