Browsing Institutt for fysikk by Title
Now showing items 2694-2713 of 2823
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Two-Component Spin-Orbit Coupled Ultracold Atoms in the Weak and Strong Coupling Regimes
(Master thesis, 2017)Motivated by recent experimental advances, we study two-component spin-orbit coupled ultracold bosonic atoms in two dimensions on a square optical lattice. Using a Bose-Hubbard model with spin-conserving and non-spin-conserving ... -
Two-dimensional altermagnets: Superconductivity in a minimal microscopic model
(Peer reviewed; Journal article, 2023)We propose a minimal toy model for a two-dimensional altermagnet. The model unravels altermagnetic properties at a microscopic level. We find spin-split electron and nondegenerate magnon bands with a d -wave symmetry. We ... -
Two-dimensional Simulations of Particle Deposition on a Cylinder in a Turbulent Cross Flow at Intermediate Reynolds Numbers
(Master thesis, 2011)The behaviour of particles in turbulent flow, with emphasis on particle deposition on both the frontside and backside of a cylinder, was investigated by means of Direct Numerical Simulations. One-way coupling between the ... -
Two-flavor chiral perturbation theory at finite isospin density beyond leading order
(Master thesis, 2020)I denne avhandlinga studerer me two-flavor QCD ved endeleg isospin kjemisk potensial ved å bruke kiral perturbasjonsteori forbi leiande orden i lågenergi ekspansjonen. Me reknar ut pionkondensatet og det kirale kondensatet ... -
Two-flavor chiral perturbation theory at nonzero isospin: Pion condensation at zero temperature
(Journal article; Peer reviewed, 2019)In this paper, we calculate the equation of state of two-flavor finite isospin chiral perturbation theory at next-to-leading order in the pion-condensed phase at zero temperature. We show that the transition from the vacuum ... -
Two-phase Flow in Porous Media: Simulations and Theory
(Doktoravhandlinger ved NTNU, 1503-8181; 2013:2, Doctoral thesis, 2012) -
Tyrosine Side-Chain Functionalities at Distinct Positions Determine the Chirooptical Properties and Supramolecular Structures of Pentameric Oligothiophenes
(Peer reviewed; Journal article, 2020)Control over the photophysical properties and molecular organization of π-conjugated oligothiophenes is essential to their use in organic electronics. Herein we synthesized and characterized a variety of anionic pentameric ... -
Ultra high energy cosmic rays The intersection of the Cosmic and Energy Frontiers
(Peer reviewed; Journal article, 2023)The present white paper is submitted as part of the “Snowmass” process to help inform the long-term plans of the United States Department of Energy and the National Science Foundation for high-energy physics. It summarizes ... -
An ultra-low field SQUID magnetometer for measuring antiferromagnetic and weakly remanent magnetic materials at low temperatures
(Journal article, 2023)A novel setup for measuring magnetic fields of antiferromagnets (i.e., quadrupolar or higher-order magnetic fields) and generally weakly remanent magnetic materials is presented. The setup features a highly sensitive ... -
Ultra-short pulsed Tm- and Er-doped all-fiber MOPA lasers and supercontinuum sources.
(Doctoral thesis, 2016-12-12)The present work describes the results of the development of a family of novel diode-pumped ultra-short and short pulsed Er- and Tm-fiber laser systems in the “eye-safe” near- and mid-Infrared (mid-IR) wavelength range for ... -
Ultrabroad Continuous-Wave Tuning of Ceramic Cr:ZnSe and Cr:ZnS Lasers
(Chapter, 2010)Using a single set of optics, we demonstrate ultrabroad tuning over more than 1300 nm from 1973 to 3349 nm in Cr:ZnSe and from 1962 to 3195 nm in Cr:ZnS at <10 GHz linewidth. -
Ultrafast control of spin interactions in honeycomb antiferromagnetic insulators
(Journal article; Peer reviewed, 2019)Light enables the ultrafast, direct, and nonthermal control of the exchange and Dzyaloshinskii-Moriya interactions. We consider two-dimensional honeycomb lattices described by the Kane-Mele-Hubbard model at half filling ... -
Ultrafast fiber-based lasers beyond 2 µm
(Chapter, 2017)The talk reviews recent advances in fiber based ultrafast mid-IR lasers and frequency combs, outlines the trends in materials as well as novel approaches for generation of ultra-broadband spectra above 2 mm. -
Ultrafast generation and dynamics of isolated skyrmions in antiferromagnetic insulators
(Peer reviewed; Journal article, 2019)Based on atomistic spin dynamics simulations, we report the ultrafast generation of single antiferromagnetic (AFM) skyrmions in a confined geometry. This process is achieved through an effective magnetic field induced by ... -
Ultrafast Laser Direct Writing as a key enabling technology for silicon processing: a new target for positronium Bose-Einstein condensation and performance improvements of the MALTA2 tracking sensor
(Master thesis, 2024)I det nåværende arbeidet viser vi to anvendelser av en laserbearbeidingsteknikk kalt Ultrafast Laser Direct Writing (ULDW). Endringer i bulk kan induseres i en krystallinsk halvleder for å kontrollere dens faste tilstand ... -
Ultrafast magnon-phonon dynamics
(Master thesis, 2022)Kontroll av magnetisme ved bruk av ultraraske laserpulser har tiltrukket seg mye oppmerksomhet de siste tiårene. Dette har resultert i intensiv forskning, både teoretisk og eksperimentell, for å forstå de mikroskopiske ... -
Ultrafast manipulation of Heisenberg exchange and Dzyaloshinskii–Moriya interactions in antiferromagnetic insulators
(Master thesis, 2019)Light enables ultrafast, direct and nonthermal control of the exchange and Dzyaloshinskii-Moriya interactions. We consider two-dimensional honeycomb lattices described by the Kane-Mele-Hubbard model at half filling and in ... -
Ultrafast Microscopy Imaging of Acoustic Cluster Therapy Bubbles: Activation and Oscillation
(Peer reviewed; Journal article, 2022)Acoustic Cluster Therapy (ACT®) is a platform for improving drug delivery and has had promising pre-clinical results. A clinical trial is ongoing. ACT® is based on microclusters of microbubbles–microdroplets that, when ... -
Ultrafast nonlocal collective dynamics of Kane plasmon-polaritons in a narrow-gap semiconductor
(Journal article; Peer reviewed, 2019)The observation of ultrarelativistic fermions in condensed-matter systems has uncovered a cornucopia of novel phenomenology as well as a potential for effective ultrafast light engineering of new states of matter. While ... -
Ultrafast Two-Magnon Excitation in Two-Dimensional Antiferromagnetic Insulators
(Master thesis, 2020)Spinneksitasjoner i todimensjonale antiferromagnetiske materialer manifesteres som spinnbølger som også er kjent som magnoner. Magnoner er bosoniske kvasipartikler som kan eksiteres ved hjelp av en laserindusert forstyrrelse ...