Browsing NTNU Open by Author "Aase, Niels Henrik"
Now showing items 1-6 of 6
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Constrained s-wave weak-coupling superconductivity in multiband superconductors
Aase, Niels Henrik; Johnsen, Christian Svingen; Sudbø, Asle (Peer reviewed; Journal article, 2023)We consider superconductivity in a system with N Fermi surfaces, including intraband and interband effective electron-electron interactions. The effective interaction is described by an N × N matrix whose elements are ... -
Dominant superconducting correlations in a Luttinger liquid induced by spin fluctuations
Aase, Niels Henrik; Sudbø, Asle (Peer reviewed; Journal article, 2022)We study spin-fluctuation mediated divergent superconducting fluctuations in a Luttinger liquid proximity-coupled to a spin chain. Our study provides insight into how spin fluctuations can induce superconductivity in a ... -
Efficient Encoding of the Weighted MAX k-CUT on a Quantum Computer Using QAOA
Fuchs, Franz Georg; Kolden, Herman Øie; Aase, Niels Henrik; Sartor, Giorgio (Peer reviewed; Journal article, 2021)The weighted MAX k-CUT problem consists of finding a k-partition of a given weighted undirected graph G(V, E), such that the sum of the weights of the crossing edges is maximized. The problem is of particular interest as ... -
Multiband strong-coupling superconductors with spontaneously broken time-reversal symmetry
Aase, Niels Henrik; Mæland, Kristian; Sudbø, Asle (Peer reviewed; Journal article, 2023)We study superconducting three-band systems within strong-coupling Eliashberg theory. In particular, we search for phase-frustrated superconducting systems with spontaneous time-reversal symmetry breaking (TRSB) states. ... -
Orbital currents in lattice multiorbital systems: Continuity equation, torques, and RKKY interaction
Aase, Niels Henrik; Hodt, Erik Wegner; Linder, Jacob Wüsthoff; Sudbø, Asle (Journal article; Peer reviewed, 2024)Utilizing the electron orbital degree of freedom in heterostructures is attracting increasing attention due to the possibility of achieving much larger conversion rates between charge and orbital angular momentum flow ... -
Slave-boson approach to the U=∞ Haldane-Hubbard model
Aase, Niels Henrik (Master thesis, 2021)I denne oppgaven studerer vi Haldane-Hubbard-modellen i grensetilfellet hvor Hubbard-frastøtning går mot uendelig. Fordi superledende ustabiliteter har blitt observert i lignende modeller, er det av spesiell interesse å ...