Blar i NTNU Open på forfatter "Sudbø, Asle"
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Phase structure and critical properties of an abelian gauge theory
Mo, Sjur (Dr. ingeniøravhandling, 0809-103X; 2001:116, Doctoral thesis, 2002)Chapter 1 to 4 give a short introduction to superconductivity, microscopic theory, phase transitions, and Monte-Carlo simulations. Chapter 2 is about Cooper pairing in different settings, but I also give a short introduction ... -
Phase-controlled proximity effect in ferromagnetic Josephson junctions: Calculation of the density of states and the electronic specific heat
Alidoust, Mohammad; Rashedi, Gholamreza; Linder, Jacob; Sudbø, Asle (Journal article; Peer reviewed, 2010)We study the thermodynamic properties of a dirty ferromagnetic S|F|S Josephson junction with s-wave superconducting leads in the low-temperature regime. We employ a full numerical solution with a set of realistic parameters ... -
Pressure-induced 0-π transitions and supercurrent crossover in antiferromagnetic weak links
Enoksen, Henrik; Linder, Jacob; Sudbø, Asle (Journal article, 2013)We compute self-consistently the Josephson current in a superconductor-antiferromagnet-superconductor junction using a lattice model, focusing on 0−π transitions occurring when the width of the antiferromagnetic region ... -
Probing phase separation in Bose-Fermi mixtures by the critical superfluid velocity
Linder, Jacob; Sudbø, Asle (Journal article; Peer reviewed, 2010)We investigate the effect exerted by spin-polarized fermions on the interaction between superfluid bosons for a Bose-Fermi mixture residing on an optical lattice, with particular emphasis on the possibility of an induced ... -
Pure spin current generated by reflection at a normal metal/two-dimensional electron gas interface
Linder, Jacob; Yokoyama, Takehito; Sudbø, Asle (Journal article; Peer reviewed, 2010)The concept of a spin current is a useful tool in understanding spin transport in hybrid systems but its very definition is problematic in systems where spin-orbit coupling effects are strong. In the absence of spin-dependent ... -
Quantum Monte Carlo Simulations of Drag Interaction in the Superfluid Phase of the 3-Component Bose-Hubbard Model
Erlandsen, Eirik (Master thesis, 2018)We study Andreev-Bashkin drag interactions between the superflow of different components in the superfluid phase of a three-component Bose-Hubbard model without component-mixing interactions, relevant for cold atom systems ... -
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 ... -
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 ... -
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 ... -
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 ... -
Triplet proximity effect and odd-frequency pairing in graphene
Linder, Jacob; Black-Schaffer, Annica; Sudbø, Asle (Journal article; Peer reviewed, 2010)We study the interplay between proximity-induced superconductivity and ferromagnetism in graphene by self-consistently solving the Bogoliubov de Gennes equations on the honeycomb lattice. We find that a strong triplet ... -
Triplet supercurrent due to spin-active zones in a Josephson junction
Linder, Jacob; Sudbø, Asle (Journal article; Peer reviewed, 2010)Motivated by a recent experiment evidencing triplet superconductivity in a ferromagnetic Josephson junction with a Cu2MnAl-Heusler barrier, we construct a theoretical model accounting for this observation. The key ingredients ... -
Two-Component Spin-Orbit Coupled Ultracold Atoms in the Triangular Lattice - A Monte Carlo Study
Homleid Haugen, Håvard (Master thesis, 2018)Teknologiske fremskritt i ultrakalde atom-eksperimenter har over de siste 20 årene økt interessen for fysisk intuitive Hamilton-funksjoner som kan brukes til å undersøke fundamentale vekselvirkninger i sterkt korrelerte ... -
Two-Component Spin-Orbit Coupled Ultracold Atoms in the Weak and Strong Coupling Regimes
Thingstad, Even (Master thesis, 2017)Motivated by recent experimental advances, we study two-component spin-orbit coupled ultracold bosonic atoms in two dimensions on a square optical lattice. Using a Bose-Hubbard model with spin-conserving and non-spin-conserving ... -
Unconventional Superconductivity on a Topological Insulator
Linder, Jacob; Tanaka, Yukio; Yokoyama, Takehito; Sudbø, Asle; Nagaosa, Naoto (Journal article; Peer reviewed, 2010)We study proximity-induced superconductivity on the surface of a topological insulator (TI), focusing on unconventional pairing. We find that the excitation spectrum becomes gapless for any spin-triplet pairing, such that ... -
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 ...