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Blar i NTNU Open på forfatter "Sudbø, Asle"

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Viser treff 21-40 av 44

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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 ...
    • Phonon-mediated superconductivity in doped monolayer materials 

      Thingstad, Even; Kamra, Akashdeep; Wells, Justin; Sudbø, Asle (Peer reviewed; Journal article, 2020)
      Insight into why superconductivity in pristine and doped monolayer graphene seems strongly suppressed has been central for the recent years' various creative approaches to realize superconductivity in graphene and graphene-like ...
    • Plane- and stripe-wave phases of a spin-orbit-coupled Bose-Einstein condensate in an optical lattice with a Zeeman field 

      Mæland, Kristian; Rygh, Jonas; Janssønn, Andreas; Sudbø, Asle (Peer reviewed; Journal article, 2020)
      A weakly interacting, spin-orbit-coupled, ultracold, dilute Bose gas on a two-dimensional square lattice with an external Zeeman field is studied. We explore the plane- and stripe-wave phases of the system involving nonzero ...
    • 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 ...
    • 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 ...
    • Proximity effects in superconducting hybrid structures with spin-dependent interactions 

      Amundsen, Morten (Doctoral theses at NTNU;2020:243, Doctoral thesis, 2020)
      When superconductors are contacted by other, non-superconducting materials, the latter may attain some of the properties of the former, and vice versa. This is the origin of a wealth of interesting phenomena. A striking ...
    • 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 ...

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