Auflistung Fakultät für Mathematik und Physik nach Titel

Auflistung Fakultät für Mathematik und Physik nach Titel

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  • Noncommutative instantons and solitons 
    Lechtenfeld, Olaf (Trieste : Sissa Medialab Srl, 2003)
    I explain how to construct noncommutative BPS configurations in four and lower dimensions by solving linear matrix equations. Examples are instantons in D=4 Yang-Mills, monopoles in D=3 Yang-Mills-Higgs, and (moving) ...
  • Noncommutative multi-instantons on R-2n x S-2 
    Ivanova, Tatiana A.; Lechtenfeld, Olaf (Amsterdam : Elsevier, 2003)
    Generalizing self-duality on R-2 x S-2 to higher dimensions, we consider the Donaldson-Uhlenbeck-Yau equations on R-2n x S-2 and their noncommutative deformation for the gauge group U(2). Imposing SO(3) invariance (up to ...
  • The noncommutative sine-Gordon breather 
    Fischer, André; Lechtenfeld, Olaf (College Park (Maryland) : American Institute of Physics, 2009)
    As shown by Lechtenfeld et al. [Nucl. Phys. B 705, 447 (2005)], there exists a noncommutative deformation of the sine-Gordon model which remains (classically) integrable but features a second scalar field. We employ the ...
  • The noncommutative ward metric 
    Lechtenfeld, Olaf; Maceda, Marco (Kyiv : Institute of Mathematics of National Academy of Sciences of Ukraine, Department of Applied Research, 2010)
    We analyze the moduli-space metric in the static non-Abelian charge-two sector of the Moyal-deformed CP1 sigma model in 1 + 2 dimensions. After carefully reviewing the commutative results of Ward and Ruback, the noncommutative ...
  • Nonconforming boundary elements and finite elements for interface and contact problems with friction : hp-version for mortar, penalty and Nitsche's methods 
    Chernov, Alexey (Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2006)
    [no abstract]
  • Nonequilibrium localization in quantum Hall systems at very low frequencies 
    Buss, A.; Hohls, Frank; Schulze-Wischeler, F.; Stellmach, C.; Hein, G.; Haug, Rolf J.; Nachtwei, G. (College Park, MD : American Physical Society, 2005)
    We have measured the conductivity σxx of GaAs GaAlAs Corbino devices under nonequilibrium conditions in the quantum Hall regime at low frequencies from dc up to 10 kHz. At very low frequencies up to 10-20 Hz, σxx shows a ...
  • Nonequilibrium mesoscopic conductance fluctuations as the origin of 1/f noise in epitaxial graphene 
    Kalmbach, C.-C.; Ahlers, Franz-J.; Schurr, J.; Müller, A.; Feilhauer, J.; Kruskopf, M.; Pierz, Klaus; Hohls, Frank; Haug, Rolf J. (College Park, MD : American Physical Society, 2016)
    We investigate the 1/f noise properties of epitaxial graphene devices at low temperatures as a function of temperature, current, and magnetic flux density. At low currents, an exponential decay of the 1/f noise power ...
  • Nonequilibrium spin noise spectroscopy on single quantum dots 
    Wiegand, Julia Susan (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2019)
    All optical spin noise spectroscopy is typically used to extract the virtually undisturbed spin dynamics from measurements of spin fluctuations in thermal equilibrium. In this thesis, the method is applied to study spin ...
  • Nonholonomic ricci flows and Finsler-Lagrange f(R,F,L)-modified gravity and dark matter effects 
    Alexiou, Maria; Gheorghiu, Tamara; Stavrinos, Panayiotis C.; Vacaru, Olivia; Vacaru, Sergiu I. (Singapur : World Scientific Publishing Co. Pte. Ltd., 2018)
    We review the theory of geometric flows on nonholonomic manifolds and tangent bundles and self-similar configurations resulting in generalized Ricci solitons and Einstein-Finsler equations. There are provided new classes ...
  • Noninvasive detection of charge rearrangement in a quantum dot 
    Fricke, Christian; Rogge, M.C.; Harke, B.; Reinwald, M.; Wegscheider, W.; Hohls, Frank; Haug, Rolf J. (College Park, MD : American Institute of Physics, 2007)
    We demonstrate new results on electron redistribution on a single quantum dot caused by magnetic field. A quantum point contact is used to detect changes in the quantum dot charge. We are able to measure both the change ...
  • Noninvasive detection of charge rearrangement in a quantum dot in high magnetic fields 
    Fricke, Christian; Rogge, M.C.; Harke, B.; Reinwald, M.; Wegscheider, W.; Hohls, Frank; Haug, Rolf J. (College Park, MD : American Physical Society, 2005)
    We demonstrate electron redistribution caused by magnetic field on a single quantum dot measured by means of a quantum point contact as noninvasive detector. Our device, which is fabricated by local anodic oxidation, allows ...
  • Noninvasive detection of molecular bonds in quantum dots 
    Rogge, M.C.; Haug, Rolf J. (College Park, MD : American Physical Society, 2008)
    We performed charge detection on a lateral triple quantum dot with starlike geometry. The setup allows us to interpret the results in terms of two double dots with one common dot. One double dot features weak tunnel coupling ...
  • Nonlinear boundary oscillations in strongly correlated electron quantum wires 
    Frahm, Holger; Zvyagin, Andrei A. (College Park (Maryland) : American Physical Society, 1997)
    We study the influence of a boundary point contact voltage on Coulomb blockadelike oscillations of the conductance in mesoscopic quantum wires of strongly correlated electrons. Bethe ansatz techniques allow one to understand ...
  • Nonlinear Landau-Zener tunneling in quantum phase space 
    Trimborn, F.; Witthaut, D.; Kegel, V.; Korsch, H. J. (Bristol : IOP Publishing Ltd., 2010)
    We present a detailed analysis of the Landau-Zener problem for an interacting Bose-Einstein condensate in a time-varying double-well trap, especially focusing on the relation between the full many-particle problem and the ...
  • Nonlinear laser scanning microscopy of oral multispecies-biofilms: Fixative induced fluorescence as a fast and economical in vitro screening method 
    Andric, Nadine; Ehmke, Tobias; Stumpp, Nico S.; Ripken, Tammo; Heisterkamp, Alexander; Stiesch, Meike (Berlin : De Gruyter, 2016)
    In this letter we report a fast and easy method which could be used for initial screening of multispecies-biofilm development on putative new dental implant materials. Most staining methods require numerous washing steps ...
  • Nonlinear optics in thin film interference coatings 
    Morten, Steinecke (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2023)
    Nonlinear optical effects play a crucial role in modern optical systems. They are applied in mode-locking for the generation of ultrashort optical pulses, in the generation of otherwise unavailable wavelengths, or for new ...
  • Nonlinear spectroscopy of closed degenerate two-level systems 
    Spani Molella, Luca (Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2006)
    [no abstract]
  • Nonlinear supersymmetry in the quantum Calogero model 
    Correa, Francisco; Lechtenfeld, Olaf; Plyushchay, Mikhail (New York : Springer, 2014)
    It is long known that the rational Calogero model describing n identical particles on a line with inverse-square mutual interaction potential is quantum superintegrable. We review the (nonlinear) algebra of the conserved ...
  • Nonquasiparticle states in the half-metallic ferromagnet simulated by the two-band Hubbard model 
    Nakano, K.; Shirakawa, T.; Ohta, Y. (Bristol : IOP Publishing Ltd., 2010)
    The density-matrix renormalization group method is used to study the three-band zigzag ladder model that simulates the electronic state of the t 2g-orbital system of the double string of the edge-shared CrO 6 octahedra in ...
  • Nonradiating sources for efficient wireless power transfer 
    Zanganeh, Ezmaeel; Song, Mingzhao; Valero, Adrìa Canós; Shalin, Alexander S.; Nenasheva, Elizaveta; Miroshnichenko, Andrey; Evlyukhin, Andrey; Kapitanova, Polina (Berlin : de Gruyter, 2021)
    Nonradiating sources of energy realized under a wave scattering on high-index dielectric nanoparticles have attracted a lot of attention in nano-optics and nanophotonics. They do not emit energy to the far-field, but ...

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