Browsing Institutt for fysikk by Subject "VDP::Kondenserte fasers fysikk: 436"
Now showing items 21-38 of 38
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Nano-scale characterisation of sheared β” precipitates in a deformed Al-Mg-Si alloy
(Journal article; Peer reviewed, 2019)This paper compares the nano-scale structure of β” precipitates in a peak-aged Al-Mg-Si alloy before and after deformation. Three complementary advanced transmission electron microscopy techniques are used to reveal the ... -
Orientation dependent pinning of (sub)grains by dispersoids during recovery and recrystallization in an Al–Mn alloy
(Peer reviewed; Journal article, 2023)The recrystallized grain size and texture in alloys can be controlled via the microchemistry state during thermomechanical processing. The influence of concurrent precipitation on recovery and recrystallization is here ... -
Plane- and stripe-wave phases of a spin-orbit-coupled Bose-Einstein condensate in an optical lattice with a Zeeman field
(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
(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 ... -
Quantum fluctuations in the order parameter of quantum skyrmion crystals
(Peer reviewed; Journal article, 2022)Traditionally, skyrmions are treated as continuum magnetic textures of classical spins with a well-defined topological skyrmion number. Owing to their topological protection, skyrmions have attracted great interest as ... -
Quantum topological phase transitions in skyrmion crystals
(Peer reviewed; Journal article, 2022)Topological order is important in many aspects of condensed matter physics and has been extended to bosonic systems. In this Letter we report on the nontrivial topology of the magnon bands in two distinct quantum skyrmion ... -
Schwinger boson study of superconductivity mediated by antiferromagnetic spin fluctuations
(Peer reviewed; Journal article, 2020)We study superconductivity in a normal metal, arising from effective electron-electron interactions mediated by spin fluctuations in a neighboring antiferromagnetic insulator. Introducing a frustrating next-nearest neighbor ... -
A Simplified Method for Patterning Graphene on Dielectric Layers
(Peer reviewed; Journal article, 2021)The large-scale formation of patterned, quasi-freestanding graphene structures supported on a dielectric has so far been limited by the need to transfer the graphene onto a suitable substrate and contamination from the ... -
Spin-active interfaces and unconventional pairing in half-metal/superconductor junctions
(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, ... -
Study of a New Type of Crimped-Shape Nanotubes Cut from Bilayer Graphene with the Moiré Angle Θ = 27.8°
(Journal article; Peer reviewed, 2020)New quasi-one-dimensional hollow nanostructures similar to flattened nanotubes are numerically simu- lated. These nanostructures can be obtained by connecting the edges of nanoribbons cut out of twisted bilayer graphene ... -
The correlation between intergranular corrosion resistance and copper content in the precipitate microstructure in an AA6005A alloy
(Journal article; Peer reviewed, 2018)A positive correlation is observed between the amount of Cu incorporated in hardening precipitates and intergranular corrosion resistance in an artificially aged Cu-containing 6005A alloy. Three mechanisms have been ... -
Thermal fluctuations and vortex lattice structures in chiral p-wave superconductors: Robustness of double-quanta vortices
(Peer reviewed; Journal article, 2021)We use large-scale Monte-Carlo simulations to study thermal fluctuations in chiral p-wave superconductors in an applied magnetic field in three dimensions. We consider the thermal stability of previously predicted unusual ... -
Topological superconductivity induced by a Kitaev spin liquid
(Peer reviewed; Journal article, 2024)We study the effective low-energy fermionic theory of the Kondo-Kitaev model to leading order in the Kondo coupling. Our main goal is to understand the nature of the superconducting instability induced in the proximate ... -
Topological superconductivity mediated by magnons of helical magnetic states
(Peer reviewed; Journal article, 2023)We recently showed that spin fluctuations of noncoplanar magnetic states can induce topological superconductivity in an adjacent normal metal [Mæland et al., Phys. Rev. Lett. 130, 156002 (2023)]. The noncolinear nature of ... -
Topological Superconductivity Mediated by Skyrmionic Magnons
(Peer reviewed; Journal article, 2023)Topological superconductors are associated with the appearance of Majorana bound states, with promising applications in topologically protected quantum computing. In this Letter, we study a system where a skyrmion crystal ... -
Tunable electro-optical properties of doped chiral graphene nanoribbons
(Peer reviewed; Journal article, 2021)The electro-optical properties of doped chiral graphene nanoribbons are investigated using first principles calculations. O-atoms on edges enhance edge reconstruction with strong C=C bonds that increase the binding energy ... -
Vacancy and solute co-segregated η1 interface in over-aged Al-Zn-Mg alloys
(Journal article; Peer reviewed, 2021)We present a combined first-principles and scanning transmission electron microscopy (STEM) study of the η1/Al interfaces in an over-aged Al-Zn-Mg alloy. As one of the major η-MgZn2 precipitate types, η1 tends to form ... -
Zero temperature superconductor–edge metal–insulator transition in two-dimensional bosonic systems
(Peer reviewed; Journal article, 2022)Motivated by the recent experimental observation of an intermediate bosonic metallic state in the two-dimensional superconductor-insulator transition at T = 0 , we study an extended Bose-Hubbard model in the limit of a ...