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Browsing by Subject "Eðlisfræði"

Browsing by Subject "Eðlisfræði"

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  • Mantovan, R.; Fallica, R.; Mokhles Gerami, A.; Mølholt, T. E.; Wiemer, C.; Longo, M.; Gunnlaugsson, Haraldur; Johnston, K.; Masenda, H.; Naidoo, D.; Ncube, M.; Bharuth-Ram, K.; Fanciulli, M.; Gíslason, Hafliði Pétur; Langouche, G.; Olafsson, Sveinn; Weyer, G. (Springer Nature, 2017-08-15)
    The underlying mechanism driving the structural amorphous-to-crystalline transition in Group VI chalcogenides is still a matter of debate even in the simplest GeTe system. We exploit the extreme sensitivity of 57Fe emission Mössbauer spectroscopy, ...
  • Shahnazaryan, Vanik (University of Iceland, School of Engineering and Natural Sciences, Faculty of Physical Sciences, 2017-10)
    The physics of light-matter interactions is a rapidly developing interdisciplinary research area, combining methods and phenomena both from condensed matter physics and quantum optics. One of the most common realizations of strong coupling regime implies ...
  • Erdmenger, Johanna; Fernández, Daniel; Goulart, Prieslei; Witkowski, Piotr (Springer Nature, 2017-03)
    In the context of applications of the AdS/CFT correspondence to condensed matter physics, we compute conductivities for field theory duals of dyonic planar black holes in 3+1-dimensional Einstein-Maxwell-dilaton theories at zero temperature. We ...
  • Kozin, Valerii (Springer Science and Business Media LLC, 2019-09-01)
    The BCFW recursion relation in N = 4 super-Yang-Mills theory is solved using Yang-Baxter R-operators in the NMHV sector. Explicit expressions for R-invariants are obtained in terms of the chains of R-operators acting on an appropriate basic state.
  • Liashko, Sergei Y; Jónsson, Hannes; Uzdin, Valery M (IOP Publishing, 2017-11-07)
    Transitions between magnetic states of one and two ring kagome spin ice elements consisting of 6 and 11 prolate magnetic islands are calculated and the lifetime of the ground states evaluated using harmonic transition state theory and the stationary ...
  • Khosa, Rabia Yasmin; Þorsteinsson, Einar Baldur; Winters, M.; Rorsman, N.; Karhu, R.; Hassan, J.; Sveinbjörnsson, Einar (AIP Publishing, 2018-02)
    We report on the electrical properties of Al2O3 films grown on 4H-SiC by successive thermal oxidation of thin Al layers at low temperatures (200°C - 300°C). MOS capacitors made using these films contain lower density of interface traps, are more immune ...
  • Khosa, Rabia Yasmin (2017)
    Silicon is a semiconductor material used in most power devices and the Si metal-oxide-semiconductor field effect transistor (MOSFET) is the key switching device for high power applications. Recently silicon carbide (SiC) MOSFETs have emerged on the ...
  • Gudmundsson, Vidar; Abdullah, Nzar Rauf; Sitek, Anna; Goan, Hsi-Sheng; Tang, Chi-Shung; Manolescu, Andrei (Wiley-Blackwell, 2017-12-07)
    We show that a Rabi-splitting of the states of strongly interacting electrons in parallel quantum dots embedded in a short quantum wire placed in a photon cavity can be produced by either the para- or the dia-magnetic electron-photon interactions ...
  • Urbaneja Torres, Miguel (2020-02-25)
    In this work, fundamental electronic and optical properties of semiconductor prismatic nanowires, which are a direct consequence of their geometry, are numerically studied. The quantum states of electrons confined in polygonal shells, which describe ...
  • von Malottki, S.; Dupé, B.; Bessarab, Pavel; Delin, A.; Heinze, S. (Springer Nature, 2017-09-26)
    Skyrmions are localized, topologically non-trivial spin structures which have raised high hopes for future spintronic applications. A key issue is skyrmion stability with respect to annihilation into the ferromagnetic state. Energy barriers for this ...
  • Angel Ramelli, Juan Fernando; Giangreco Puletti, Valentina; Thorlacius, Larus (Springer Science and Business Media LLC, 2019-08-01)
    We compute universal finite corrections to entanglement entropy for generalised quantum Lifshitz models in arbitrary odd spacetime dimensions. These are generalised free field theories with Lifshitz scaling symmetry, where the dynamical critical exponent ...
  • Mökkönen, Harri (Aalto University, Helsinki;University of Iceland, Reykjavik, 2016)
    A polymer escaping from a confining external potential represents a generic description of long macromolecules crossing an energy barrier. This type of barrier crossing problems are typical in nano- and microscale polymeric systems, where the polymers ...
  • Whittaker, C. E.; Cancellieri, E.; Walker, P. M.; Gulevich, D. R.; Schomerus, H.; Vaitiekus, D.; Royall, B.; Whittaker, D. M.; Clarke, E.; Iorsh, Ivan; Shelykh, Ivan; Skolnick, M. S.; Krizhanovskii, D. N. (American Physical Society (APS), 2018-03-02)
    We study exciton polaritons in a two-dimensional Lieb lattice of micropillars. The energy spectrum of the system features two flat bands formed from S and P x , y photonic orbitals, into which we trigger bosonic condensation under high power ...
  • Sitek, Anna; Urbaneja Torres, Miguel; Torfason, Kristinn; Gudmundsson, Vidar; Bertoni, Andrea; Manolescu, Andrei (American Chemical Society, 2018-04-21)
    The distinctive prismatic geometry of semiconductor core-shell nanowires leads to complex localization patterns of carriers. Here, we describe the formation of optically active in-gap excitonic states induced by the interplay between localization of ...
  • Kateb, Movaffaq (University of Iceland, School of Engineering and Natural Sciences, Faculty of Physical Sciences, 2019-12-12)
    Permalloy Ni80Fe20 at. % (Py) is a well-known ferromagnet utilized in anisotropic magnetoresistance and planar Hall effect sensors as well as magnetic read heads in magnetic memories. These applications rely on the uniaxial magnetic anisotropy in ...
  • Varentsova, A.S.; Potkina, Maria; von Malottki, S.; Heinze, S.; Bessarab, Pavel (ITMO University, 2018-06-24)
    The relationship between the size and stability of isolated skyrmions in a magnetic monolayer is analyzed based on minimum energy path calculations and atomistic spin Hamiltonian. It is demonstrated that the energy barrier protecting the skyrmion from ...
  • Sitek, Anna; Ţolea, Mugurel; Niţă, Marian; Serra, Llorenç; Gudmundsson, Vidar; Manolescu, Andrei (Springer Nature, 2017-01-10)
    We study Coulomb interacting electrons confined in polygonal quantum rings. We focus on the interplay of localization at the polygon corners and Coulomb repulsion. Remarkably, the Coulomb repulsion allows the formation of in-gap states, i.e., ...
  • Novoselova, Iuliia P.; Petruhins, Andrejs; Wiedwald, Ulf; Ingason, Árni Sigurdur; Hase, Thomas; Magnus, Fridrik; Kapaklis, Vassilios; Palisaitis, Justinas; Spasova, Marina; Farle, Michael; Rosen, Johanna; Salikhov, Ruslan (Springer Nature, 2018-02-08)
    In 2013, a new class of inherently nanolaminated magnetic materials, the so called magnetic MAX phases, was discovered. Following predictive material stability calculations, the hexagonal Mn2GaC compound was synthesized as hetero-epitaxial films ...
  • Juhl, Michael (University of Iceland, School of Engineering and Natural Sciences, Faculty of Physical Sciences, 2018-10)
    The polarization of electromagnetic waves (the direction of transversal vibration of its electric field vector) provides essential information about the emitting sources and scattering objects. Its measurement, i.e., optical polarimetry, has a history ...
  • Khanin, Vasilii M.; Vrubel, Ivan I.; Polozkov, Roman G.; Shelykh, Ivan; Venevtsev, Ivan D.; Meijerink, Andries; Wieczorek, Herfried; Boerekamp, Jack; Spoor, Sandra; Rodnyi, Piotr A.; Ronda, Cees (American Chemical Society (ACS), 2019-02-18)
    Afterglow is an important phenomenon in luminescent materials and can be desired (e.g., persistent phosphors) or undesired (e.g., scintillators). Understanding and predicting afterglow is often based on analysis of thermally stimulated luminescence ...