Browsing NTNU Open by Author "Amundsen, Morten"
Now showing items 1-19 of 19
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Beyond the Chandrasekhar-Clogston limit in a spin-split superconductor driven out of equilibrium by a spin-accumulation
Tjernshaugen, Johanne Bratland (Master thesis, 2023)En spinn-splittet superledende film koblet til normalmetall-reservoarer drevet ut av likevekt av en spinnavhengig spenning blir undersøkt numerisk ved å løse den kvasiklassiske Usadelligningen. To ulike oppsett blir ... -
Combined Zeeman and orbital effect on the Josephson effect in rippled graphene
Fyhn, Eirik Holm; Amundsen, Morten; Zalic, Ayelet; Dvir, Tom; Steinberg, Hadar; Linder, Jacob (Peer reviewed; Journal article, 2020)The two-dimensional nature of graphene Josephson junctions offers the possibility of creating effective superconductor-ferromagnet-superconductor junctions with tunable Zeeman splitting caused by an in-plane magnetic field. ... -
Controlling supercurrents and their spatial distribution in ferromagnets
Lahabi, Kaveh; Amundsen, Morten; Ouassou, Jabir Ali; Beukers, Ewout; Pleijster, Menno; Linder, Jacob; Alkemade, Paul; Aarts, Jan (Journal article; Peer reviewed, 2017)Spin-triplet Cooper pairs induced in ferromagnets form the centrepiece of the emerging field of superconducting spintronics. Usually the focus is on the spin-polarization of the triplets, potentially enabling low-dissipation ... -
Curvature-induced long-range supercurrents in diffusive superconductor-ferromagnet-superconductor Josephson junctions with a dynamic 0−π transition
Salamone, Tancredi; Svendsen, Mathias Bo Mjøen; Amundsen, Morten; Jacobsen, Sol (Peer reviewed; Journal article, 2021)We report that spin supercurrents can be induced in diffusive superconductor-ferromagnet-superconductor Josephson junctions without any magnetic misalignment or intrinsic spin-orbit coupling. Instead, the pathway to ... -
Dynamic Analysis of Offshore Concrete Structures subjected to Earthquake
Amundsen, Morten (Master thesis, 2012)This thesis attempts to study the dynamic response of offshore concrete structures by sequentially introducing physical phenomena which are related to those types of analyses. This is done by modelling a simplified part ... -
Field-free nucleation of antivortices and giant vortices in non-superconducting materials
Amundsen, Morten; Ouassou, Jabir Ali; Linder, Jacob (Journal article; Peer reviewed, 2018)are usually energetically unfavorable, but geometric symmetry constraints on a superconductor in a magnetic field are known to stabilize such objects. Here, we show via microscopic calculations that giant vortices can ... -
General solution of 2D and 3D superconducting quasiclassical systems: Coalescing vortices and nanoisland geometries
Amundsen, Morten; Linder, Jacob (Journal article; Peer reviewed, 2016)An extension of quasiclassical Keldysh-Usadel theory to higher spatial dimensions than one is crucial in order to describe physical phenomena like charge/spin Hall effects and topological excitations like vortices and ... -
Inverse proximity effect in s-wave and d-wave superconductors coupled to topological insulators
Hugdal, Henning Goa; Amundsen, Morten; Linder, Jacob; Sudbø, Asle (Journal article; Peer reviewed, 2019)We study the inverse proximity effect in a bilayer consisting of a thin s- or d-wave superconductor (S) and a topological insulator (TI). Integrating out the topological fermions of the TI, we find that spin-orbit coupling ... -
Long-ranged triplet supercurrent in a single in-plane ferromagnet with spin-orbit coupled contacts to superconductors
Eskilt, Johannes Røsok; Amundsen, Morten; Banerjee, Niladri; Linder, Jacob (Journal article; Peer reviewed, 2019)By converting conventional spin-singlet Cooper pairs to polarized spin-triplet pairs, it is possible to sustain long-ranged spin-polarized supercurrents flowing through strong ferromagnets. Obtaining such a conversion via ... -
Microwave control of the superconducting proximity effect and minigap in magnetic and normal metals
Linder, Jacob; Amundsen, Morten; Ouassou, Jabir Ali (Journal article; Peer reviewed, 2016)We demonstrate theoretically that microwave radiation applied to superconducting proximity structures controls the minigap and other spectral features in the density of states of normal and magnetic metals, respectively. ... -
Planar graphene-NbSe2 Josephson junctions in a parallel magnetic field
Dvir, Tom; Zalic, Ayelet; Fyhn, Eirik Holm; Amundsen, Morten; Taniguchi, Takashi; Watanabe, Kenji; Linder, Jacob; Steinberg, Hadar (Peer reviewed; Journal article, 2021)Thin transition metal dichalcogenides sustain superconductivity at large in-plane magnetic fields due to Ising spin-orbit protection, which locks their spins in an out-of-plane orientation. Here we use thin NbSe2 as ... -
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 ... -
Quasiclassical boundary conditions for spin-orbit coupled interfaces with spin-charge conversion
Linder, Jacob; Amundsen, Morten (Peer reviewed; Journal article, 2022)The quasiclassical theory of superconductivity provides a methodology to study emergent phenomena in hybrid structures comprised of superconductors interfaced with other materials. A key component in this theory is the ... -
Quasiclassical Theory Beyond 1D: Supercurrents and Topological Excitations
Amundsen, Morten (Master thesis, 2016)The finite element method is used to solve the quasiclassical Usadel equation, valid for diffusive superconducting hybrid systems, in higher dimensions than one. A detailed derivation of the method is given, and it is ... -
Quasiclassical theory for interfaces with spin-orbit coupling
Amundsen, Morten; Linder, Jacob (Journal article; Peer reviewed, 2019)In recent years, substantial progress has been made regarding the application of quasiclassical theory on superconducting hybrid structures. This theoretical framework is reliant on a proper set of boundary conditions in ... -
Spin accumulation induced by a singlet supercurrent
Amundsen, Morten; Linder, Jacob (Peer reviewed; Journal article, 2020)We show that a supercurrent carried by spinless singlet Cooper pairs can induce a spin accumulation in the normal metal interlayer of a Josephson junction. This phenomenon occurs when a nonequilibrium spin-energy mode is ... -
Supercurrent vortex pinball via a triplet Cooper pair inverse Edelstein effect
Amundsen, Morten; Linder, Jacob (Journal article, 2017)We consider the Josephson effect through a thin spin-orbit coupled layer in the presence of an exchange field h, and discover a set of supercurrent vortices appearing in the system which can be controllably moved around ... -
Unconventional Meissner screening induced by chiral molecules in a conventional superconductor
Alpern, Hen; Amundsen, Morten; Hartmann, Roman; Sukenik, Nir; Spuri, Alfredo; Yochelis, Shira; Prokscha, Thomas; Gutkin, Vitaly; Anahory, Yonathan; Scheer, Elke; Linder, Jacob; Salman, Zaher; Millo, Oded; Paltiel, Yossi; Di Bernardo, Angelo (Peer reviewed; Journal article, 2021)The coupling of a superconductor (SC) to a different material often results in a system with unconventional superconducting properties. A conventional SC is a perfect diamagnet expelling magnetic fields out of its volume, ... -
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 ...