• Low Energy Electronic Properties of Graphene and Molybdenum Disulfide 

      Blikø, Monika (Master thesis, 2013)
      We investigate the electronic structure of two-dimensional (2D)materials with and without spin-orbit coupling. Initially, we use thetight-binding model to derive the electronic structure of graphene with staggered sublattice ...
    • Low-Energy Electronic Properties of Graphene 

      Vatanparast, Maryam (Master thesis, 2013)
      We investigate the electronic structure of two-dimensional (2D) mate- rials with and without spin-orbit coupling. Initially, we use the tight- binding model to derive the electronic structure of graphene with stag- gered ...
    • Magnetization Dissipation in Bulk Ferromagnets and Ferromagnetic Quantum Dots 

      Fjærbu, Eirik Løhaugen (Master thesis, 2014)
      We study the magnetization dynamics of a nano-scale ferromagnet. We show that the phenomenological Landau-Lifschitz-Gilbert predicts a damped precession of the magnetization. The ferromagnet is coupled to two large reservoirs ...
    • Magnetization dynamics in nanostructures 

      Flovik, Vegard (Doctoral theses at NTNU;2016:360, Doctoral thesis, 2016)
      Summary of thesis: Understanding the properties of magnetic structures when confined to nanoscale dimensions is of both fundamental interest, as well as of importance for the development of modern electronics technology. ...
    • Magnon decay theory of Gilbert damping in metallic antiferromagnets 

      Simensen, Haakon Thømt; Kamra, Akashdeep; Troncoso, Roberto; Brataas, Arne (Peer reviewed; Journal article, 2020)
      Gilbert damping is a key property governing magnetization dynamics in ordered magnets. We present a theoretical study of intrinsic Gilbert damping induced by magnon decay in antiferromagnetic metals through s−d exchange ...
    • Magnon Excitations of a Dzyaloshinskii-Moriya Coupled Insulating 2D Antiferromagnetic Skyrmion 

      Sørheim, Sondre Bergem (Master thesis, 2018)
      Motivated by recent experimental progress in realizing novel antiferromagnetic phases with state-of-the-art characteristics for memory storage and information processing, we study the magnon excitation spectra and eigenmodes ...
    • Magnon-Mediated Indirect Exciton Condensation through Antiferromagnetic Insulators 

      Johansen, Øyvind; Kamra, Akashdeep; Ulloa, Camilo; Brataas, Arne; Duine, Rembert (Journal article; Peer reviewed, 2019)
      Electrons and holes residing on the opposing sides of an insulating barrier and experiencing an attractive Coulomb interaction can spontaneously form a coherent state known as an indirect exciton condensate. We study a ...
    • 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-polarons in cubic collinear antiferromagnets 

      Simensen, Haakon Thømt; Troncoso, Roberto; Kamra, Akashdeep; Brataas, Arne (Peer reviewed; Journal article, 2019)
      We present a theoretical study of excitations formed by hybridization between magnons and phonons—magnon-polarons—in antiferromagnets. We first outline a general approach to determining which magnon and phonon modes can ...
    • Manipulating Spins in Antiferromagnets with External Forces 

      Tveten, Erlend Grytli (Doctoral thesis at NTNU;2016:114, Doctoral thesis, 2016)
      This thesis presents five papers on theoretical spintronics. Four of the papers describe antiferromagnets and the interactions between the magnetic order parameter and external forces induced by charge currents, spin ...
    • Noise and dissipation in magnetoelectronic nanostructures 

      Foros, Jørn (Doctoral Theses at NTNU, 1503-8181; 2008:112, Doctoral thesis, 2008)
      This thesis adresses electric and magnetic noise and dissipation in magnetoelectronic nanostructures. Charge and spin current fluctuations are studied in various nanosized metallic structures consisting of both ferromagnetic ...
    • Nonlocal Coupling between Antiferromagnets and Ferromagnets in Cavities 

      Johansen, Øyvind; Brataas, Arne (Journal article; Peer reviewed, 2018)
      Microwaves couple to magnetic moments in both ferromagnets and antiferromagnets. Although the magnons in ferromagnets and antiferromagnets radically differ, they can become entangled via strong coupling to the same microwave ...
    • Normal and superfluid spin dynamics in magnetic insulator heterostructures 

      Skarsvåg, Hans Langva (Doctoral theses at NTNU;2016:334, Doctoral thesis, 2016)
      Summary of thesis: Normal and superfluid spin dynamics in magnetic insulator heterostructures In this thesis, the results of six research papers on spintronics-related effects are presented. The main focus is on ...
    • Optical conversion of pure spin currents in hybrid molecular devices 

      Wheeler, May C; Ma'Mari, Fatma Al; Rogers, Matthew; Goncalves, Francisco J; Moorsom, Timothy; Brataas, Arne; Stamps, Robert; Ali, Mannan; Burnell, Gavin; Hickey, BJ; Cespedes, Oscar (Journal article; Peer reviewed, 2017)
      Carbon-based molecules offer unparalleled potential for THz and optical devices controlled by pure spin currents: a low-dissipation flow of electronic spins with no net charge displacement. However, the research so far has ...
    • Phenomenology of current-induced skyrmion motion in antiferromagnets 

      Velkov, H; Gomonay, O; Beens, M; Schwiete, G; Brataas, Arne; Sinova, J; Duine, R A (Journal article; Peer reviewed, 2016)
      We study current-driven skyrmion motion in uniaxial thin film antiferromagnets in the presence of the Dzyaloshinskii–Moriya interactions and in an external magnetic field. We phenomenologically include relaxation and ...
    • Quantum Phenomena at Magnetic Insulator-Normal Metal Interfaces 

      Fjærbu, Eirik Løhaugen (Doctoral theses at NTNU;2018:249, Doctoral thesis, 2018)
      Electrons carry an intrinsic angular momentum that we call spin. Spintronics is a field of research which aims to create new computer technology by making use of the electron spin. This thesis presents the results of four ...
    • Renormalised Intrinsic and Extrinsic Impurity Induced Spin-orbit Scattering in Graphene 

      Gislesen, Halvor; Skarsvåg, Hans (Master thesis, 2012)
      We study the effect of an impurity potential on spin-memory loss in graphene. Various general methods for finding the spin-orbit related effect of a slowly varying impurity potential on a semiconductor have been examined. ...
    • Scattering theory of transport through disordered magnets 

      Jakobsen, Martin Fonnum; Qaiumzadeh, Alireza; Brataas, Arne (Journal article; Peer reviewed, 2019)
      We present a scattering theory of transport through noncollinear disordered magnetic insulators. For concreteness, we study and compare the random field model (RFM) and the random anisotropy model (RAM). The RFM and RAM ...
    • Spin currents and torques via magnons, electrons, and Cooper pairs 

      Risinggård, Vetle Kjær (Doctoral theses at NTNU;2019:224, Doctoral thesis, 2019)
      Spin-based electronics—spintronics—is a candidate technology for complementing or replacing traditional semiconductor electronics at the end of Moore's law. We consider different spin carriers—electrons, magnons, and Cooper ...
    • Spin dynamics in magnetic structures: A numerical study 

      Wirak, Mette (Master thesis, 2019)
      Spintronikk foreslår en alterativ måte å gjøre datalagring på, som vil kunne være både mer effektiv og raskere. Grunnlaget for forskningsfeltet er den kvantemekaniske egenskapen spinn, som gjennom spinnbølger kan forflyttes ...