Blar i NTNU Open på forfatter "Brataas, Arne"
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Dc Josephson Effect in Altermagnets
Ouassou, Jabir Ali; Brataas, Arne; Linder, Jacob Wüsthoff (Journal article; Peer reviewed, 2023)The ability of magnetic materials to modify superconductors is an active research area for possible applications in thermoelectricity, quantum sensing, and spintronics. We consider the fundamental properties of the Josephson ... -
Detection of Topological Spin Textures via Nonlinear Magnetic Responses
Stepanova, Mariia; Masell, Jan; Lysne, Erik Nikolai; Schoenherr, Peggy; Köhler, Laura; Paulsen, Michael; Qaiumzadeh Javinani, Alireza; Kanazawa, Naoya; Rosch, Achim; Tokura, Yoshinori; Brataas, Arne; Garst, Markus; Meier, Dennis Gerhard (Peer reviewed; Journal article, 2021)Topologically nontrivial spin textures, such as skyrmions and dislocations, display emergent electrodynamics and can be moved by spin currents over macroscopic distances. These unique properties and their nanoscale size ... -
Detection of Topological Spin Textures via Nonlinear Magnetic Responses
Stepanova, Mariia; Masell, Jan; Lysne, Erik; Schoenherr, Peggy; Köhler, Laura; Paulsen, Michael; Qaiumzadeh Javinani, Alireza; Kanazawa, Naoya; Rosch, Achim; Tokura, Yoshinori; Brataas, Arne; Garst, Markus; Meier, Dennis Gerhard (Peer reviewed; Journal article, 2022)Topologically nontrivial spin textures, such as skyrmions and dislocations, display emergent electrodynamics and can be moved by spin currents over macroscopic distances. These unique properties and their nanoscale size ... -
Efficient ultrafast field-driven spin current generation for spintronic terahertz frequency conversion
Ilyakov, Igor; Brataas, Arne; de Oliveira, Thales V. A. G.; Ponomaryov, Alexey; Deinert, Jan-Christoph; Hellwig, Olav; Faßbender, Jürgen; Lindner, Jürgen; Salikhov, Ruslan; Kovalev, Sergey (Peer reviewed; Journal article, 2023)Efficient generation and control of spin currents launched by terahertz (THz) radiation with subsequent ultrafast spin-to-charge conversion is the current challenge for the next generation of high-speed communication and ... -
Efficient ultrafast field-driven spin current generation for spintronic terahertz frequency conversion
Ilyakov, Igor; Brataas, Arne; de Oliveira, Thales V. A. G.; Ponomaryov, Alexey; Deinert, Jan-Christoph; Hellwig, Olav; Fassbender, Jurgen; Lindner, Jürgen; Salikhov, Ruslan; Kovalev, Sergey (Peer reviewed; Journal article, 2023)Efficient generation and control of spin currents launched by terahertz (THz) radiation with subsequent ultrafast spin-to-charge conversion is the current challenge for the next generation of high-speed communication and ... -
Electrically driven Bose-Einstein condensation of magnons in antiferromagnets
Fjærbu, Eirik Løhaugen; Rohling, Niklas; Brataas, Arne (Journal article; Peer reviewed, 2017)We explore routes to realize electrically driven Bose-Einstein condensation of magnons in insulating antiferromagnets. Even in insulating antiferromagnets, the localized spins can strongly couple to itinerant spins in ... -
Enhanced Spin Conductance of a Thin-Film Insulating Antiferromagnet
Bender, Scott A.; Skarsvåg, Hans Langva; Brataas, Arne; Duine, R A (Journal article; Peer reviewed, 2017)We investigate spin transport by thermally excited spin waves in an antiferromagnetic insulator. Starting from a stochastic Landau-Lifshitz-Gilbert phenomenology, we obtain the out-of-equilibrium spin-wave properties. In ... -
Enhancement of superconductivity mediated by antiferromagnetic squeezed magnons
Erlandsen, Eirik; Kamra, Akashdeep; Brataas, Arne; Sudbø, Asle (Journal article; Peer reviewed, 2019)We theoretically investigate magnon-mediated superconductivity in a heterostructure consisting of a normal metal and a two-sublattice antiferromagnetic insulator. The attractive electron-electron pairing interaction is ... -
Equations of motion and frequency dependence of magnon-induced domain wall motion
Risinggård, Vetle Kjær; Tveten, Erlend Grytli; Brataas, Arne; Linder, Jacob (Journal article; Peer reviewed, 2017)Spin waves can induce domain wall motion in ferromagnets. We derive the equations of motion for a transverse domain wall driven by spin waves. Our calculations show that the magnonic spin-transfer torque does not cause ... -
Fingerprints of Universal Spin-Stiffness Jump in Two-Dimensional Ferromagnets
Troncoso, Roberto; Brataas, Arne; Sudbø, Asle (Peer reviewed; Journal article, 2020)Motivated by recent progress on synthesizing two-dimensional magnetic van der Waals systems, we propose a setup for detecting the topological Berezinskii-Kosterlitz-Thouless phase transition in spintransport experiments ... -
Hybrid devices for protected quantum information processing
Lidal, Jonas (Doctoral theses at NTNU;2023:260, Doctoral thesis, 2023)Quantum information is very fragile, and it is clear that we need to develop better qubits and employ error correction, in order to make use of the full potential that quantum computation has. In this thesis we explore ... -
Impact of inherent energy barrier on spin-orbit torques in magnetic-metal/semimetal heterojunctions
Gao, Tenghua; Qaiumzadeh, Alireza; Troncoso, Roberto E.; Haku, Satoshi; An, Hongyu; Nakayama, Hiroki; Tazaki, Yuya; Zhang, Song; Tu, Rong; Asami, Akio; Brataas, Arne; Ando, Kazuya (Peer reviewed; Journal article, 2023)Spintronic devices are based on heterojunctions of two materials with different magnetic and electronic properties. Although an energy barrier is naturally formed even at the interface of metallic heterojunctions, its ... -
Interfacial magnon-mediated superconductivity in twisted bilayer graphene
Brekke, Bjørnulf; Sudbø, Asle; Brataas, Arne (Journal article; Peer reviewed, 2024)The interfacial coupling between electrons and magnons in adjacent layers can mediate an attractive electron–electron interaction and induce superconductivity. We consider magic-angle twisted bilayer graphene sandwiched ... -
Intrinsic magnetization of antiferromagnetic textures
Tveten, Erlend Grytli; Muller, Tristan; Linder, Jacob; Brataas, Arne (Journal article, 2016)Antiferromagnets (AFMs) exhibit intrinsic magnetization when the order parameter spatially varies. This intrinsic spin is present even at equilibrium and can be interpreted as a twisting of the homogeneous AFM into a state ... -
Long-distance spin-transport across the Morin phase transition up to room temperature in ultra-low damping single crystals of the antiferromagnet α-Fe2O3
Lebrun, Romain; Ross, Andrew; Gomonay, Olena; Baltz, V.; Ebels, U; Barra, Anne Laure; Qaiumzadeh, Alireza; Brataas, Arne; Sinova, Jairo; Klaui, Mathias Michael (Peer reviewed; Journal article, 2020)Antiferromagnetic materials can host spin-waves with polarizations ranging from circular to linear depending on their magnetic anisotropies. Until now, only easy-axis anisotropy antiferromagnets with circularly polarized ... -
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 ... -
Low-energy properties of electrons and holes in CuFeS2
Brekke, Bjørnulf; Malyshev, Roman; Svenum, Ingeborg-Helene; Selbach, Sverre Magnus; Tybell, Per Thomas Martin; Brüne, Christoph; Brataas, Arne (Peer reviewed; Journal article, 2022)The antiferromagnetic semiconductor CuFeS2 belongs to a magnetic symmetry class that is of interest for spintronics applications. In addition, its crystal lattice is compatible with Si, making it possible to integrate it ... -
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 ferromagnetic, antiferromagnetic and superconducting systems
Simensen, Haakon Thømt (Doctoral theses at NTNU;2021:197, Doctoral thesis, 2021)The electron spin is an intrinsic property of the electron, just as its charge. Its spin is binary of nature, and is therefore well suited for encoding 0’s and 1’s in computers. The technology aiming to utilize the electron ...