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Browsing NTNU Open by Author "Yokoyama, Takehito"

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    • Anisotropic Paramagnetic Meissner Effect by Spin-Orbit Coupling 

      Espedal, Camilla; Yokoyama, Takehito; Linder, Jacob (Journal article, 2016)
      Conventional s-wave superconductors repel an external magnetic field. However, a recent experiment [A. Di Bernardo et al., Phys. Rev. X 5, 041021 (2015)] has tailored the electromagnetic response of superconducting ...
    • Anomalous magnetic transport in ferromagnetic graphene junctions 

      Yokoyama, Takehito; Linder, Jacob (Journal article; Peer reviewed, 2011)
      We investigate magnetotransport in a ferromagnetic-normal-ferromagnetic graphene junction where a gate electrode is attached to the normal segment. It is shown that the charge conductance can be maximal at an antiparallel ...
    • 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 ...
    • Josephson effect through magnetic skyrmions 

      Yokoyama, Takehito; Linder, Jacob (Journal article; Peer reviewed, 2015)
      We discover that the multiple degrees of freedom associated with magnetic skyrmions—size, position, and helicity—can all be used to control the Josephson effect and 0 − π transitions occurring in superconductor/magnetic ...
    • 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 ...
    • 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 Current in Generic Hybrid Structures due to Interfacial Spin-Orbit Scattering 

      Linder, Jacob; Yokoyama, Takehito (Journal article; Peer reviewed, 2011)
      We demonstrate a general principle that hybrid structures of any sort inevitably will give rise to a pure spin current flowing parallel to the interface region when a charge current is injected. This stems from the broken ...
    • 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, ...
    • Superconducting proximity effect in silicene: Spin-valley-polarized Andreev reflection, nonlocal transport, and supercurrent 

      Linder, Jacob; Yokoyama, Takehito (Journal article; Peer reviewed, 2014)
      We theoretically study the superconducting proximity effect in silicene, which features massive Dirac fermions with a tunable mass (band gap), and compute the conductance across a normal-superconductor (N-S) silicene ...
    • 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 ...

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