Now showing items 281-300 of 459

  • Peierls-type instability and tunable band gap in functionalized graphene 

    Abanin, D.A.; Shytov, A.V.; Levitov, L.S. (American Physical Society, 2010)
    Functionalizing graphene was recently shown to have a dramatic effect on the electronic properties of this material. Here we investigate spatial ordering of adatoms driven by the RKKY-type interactions. In the ordered ...
  • Perfect imaging with positive refraction in three dimensions 

    Leonhardt, Ulf; Philbin, Thomas G. (American Physical Society, 2010)
    Maxwell's fish eye has been known to be a perfect lens within the validity range of ray optics since 1854. Solving Maxwell's equations we show that the fish-eye lens in three dimensions has unlimited resolution for ...
  • Perfect-fluid cylinders and walls - sources for the Levi-Civita space-time 

    Philbin, Thomas G. (Institute of Physics, 1996)
  • Persistent Magnetic Wreaths in a Rapidly Rotating Sun 

    Brown, Benjamin P.; Browning, Matthew K.; Brun, Allan Sacha; Miesch, Mark S.; Toomre, Juri (American Astronomical Society / IOP Publishing, 2010)
    When our Sun was young it rotated much more rapidly than now. Observations of young, rapidly rotating stars indicate that many possess substantial magnetic activity and strong axisymmetric magnetic fields. We conduct ...
  • Phase resonances on metal gratings of identical, equally spaced alternately tapered slits 

    Rance, Helen J.; Hamilton, Oliver K.; Sambles, J. Roy; Hibbins, Alastair P. (American Institute of Physics, 2009)
    Phase resonances are observed in the microwave response of metal transmission gratings comprised of identical but alternately orientated tapered slits. Despite each slit having identical dimensions, and being equally spaced ...
  • Phase-change technologies: from PCRAM to probe-storage to processors 

    Wright, C. David; Ashawaraya, S.; Ashwin, Peter; Aziz, Mustafa M.; Hicken, R.J.; Kohary, Krisztian; Liu, Y.; Marmier, Arnaud; Shah, P.; Vazquez Diosdado, Jorge A.; Wang, Lei (2010)
    Phase-change materials based on chalcogenide alloys, for example GeSbTe and AgInSbTe, show remarkable properties such as: the ability to be crystallized by pulses in the (hundreds of) femtoseconds region while at the same ...
  • Phase-resolved x-ray ferromagnetic resonance measurements in fluorescence yield 

    Marcham, Max K.; Keatley, Paul Steven; Neudert, A.; Hicken, R.J.; Cavill, Stuart A.; Shelford, L.R.; van der Laan, Gerrit; Telling, N.D.; Childress, J.R.; Katine, J.A.; Shafer, P.; Arenholz, E. (American Institute of Physics, 2011)
    Phase-resolved x-ray ferromagnetic resonance (XFMR) has been measured in fluorescence yield, extending the application of XFMR to opaque samples on opaque substrates. Magnetization dynamics were excited in a Co50Fe50(0.7 ...
  • Photon emission induced by elastic exciton-carrier scattering in semiconductor quantum wells 

    Ouerdane, H.; Varache, R.; Portnoi, M.E.; Galbraith, I. (Springer-Verlag, 2008)
    We present a study of the elastic exciton-electron (X-e−) and exciton-hole (X-h) scattering processes in semiconductor quantum wells, including fermion exchange effects. The balance between the exciton and the free carrier ...
  • Photonic band structure and emission characteristics of a metal-backed polymeric distributed feedback laser 

    Andrew, P.; Turnbull, G. A.; Samuel, I. D. W.; Barnes, William L. (American Institute of Physics, 2002)
    Optical losses associated with the metallic contacts necessary for charge injection are an obstacle to the development of an electrically pumped polymer laser. We show that it may be possible to overcome these losses by ...
  • Photonic bandgaps for grating-coupled waveguide modes with a silver tunnel barrier 

    Chen, Z.; Hooper, Ian R.; Sambles, J. Roy (Institute of Physics and Deutsche Physikalische Gesellschaft, 2007)
    The optical properties of a periodically modulated photoresist waveguide structure has been explored using the Kretschmann–Raether configuration with a thin silver tunnel barrier. A detailed experimental study of how ...
  • Photonic mode dispersion of a two-dimensional distributed feedback polymer laser 

    Turnbull, G. A.; Andrew, P.; Barnes, William L.; Samuel, I. D. W. (American Physical Society, 2003)
    We present an analysis of the photonic mode dispersion of a two-dimensional (2D) distributed feedback polymer laser based on the conjugated polymer poly[2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylene vinylene]. We use a ...
  • The photospheric abundances of active binaries. I. Detailed analysis of HD 113816 (IS Vir) and HD 119285 (V851 Cen) 

    Katz, D.; Favata, F.; Aigrain, Suzanne; Micela, G. (EDP Sciences, 2003)
    The high-resolution optical spectra of the two X-ray active binaries RS CVn stars HD113816 (IS Vir) and HD119285 (V851 Cen) are analysed and their Na, Mg, Al, Si, Ca, Sc, Ti, Co and Ni contents determined, in the framework ...
  • Photospheric activity and rotation of the planet-hosting star CoRoT-4a 

    Lanza, A. F.; Aigrain, Suzanne; Messina, S.; Leto, G.; Pagano, I.; Auvergne, M.; Baglin, A.; Barge, P.; Bonomo, A. S.; Collier Cameron, A.; Cutispoto, G.; Deleuil, M.; De Medeiros, J. R.; Foing, B.; Moutou, C. (EDP Sciences, 2009)
    Aims. The space experiment CoRoT has recently detected a transiting hot Jupiter in orbit around a moderately active F-type mainsequence star (CoRoT-4a). This planetary system is of particular interest because it has an ...
  • Picosecond large angle reorientation of the magnetization in Ni81Fe19 circular thin-film elements 

    Wu, J.; Schmool, D.S.; Hughes, N.D.; Moore, J.R.; Hicken, R.J. (American Institute of Physics, 2002)
    Large angle picosecond reorientation of the magnetization has been studied in circular Ni81Fe19 thin-film elements of 30 μm diameter and 500 Å thickness by means of an optical pump–probe technique. The sample was pumped ...
  • Picosecond magnetization dynamics in nanomagnets: Crossover to nonuniform precession 

    Kruglyak, V.V.; Barman, A.; Hicken, R.J.; Childress, J.R.; Katine, J.A. (American Physical Society, 2005)
    The picosecond magnetization dynamics of arrays of square Ni88Fe12∕Co80Fe20 bilayer nanoelements were studied by optical pump-probe measurements. Experimentally observed modes were found to fall upon two branches, with a ...
  • Planetary transit candidates in Corot-IRa01 field 

    Carpano, S.; Cabrera, J.; Alonso, R.; Barge, P.; Aigrain, Suzanne; Almenara, J.-M.; Bordé, P.; Bouchy, F.; Carone, L.; Deeg, H. J.; De la Reza, R.; Deleuil, M.; Dvorak, R.; Erikson, A.; Fressin, F.; Fridlund, M.; Gondoin, P.; Guillot, T.; Hatzes, A.; Jorda, L.; Lammer, H.; Léger, A.; Llebaria, A.; Magain, P.; Moutou, C.; Ofir, A.; Ollivier, M.; Janot-Pacheco, E.; Pätzold, M.; Pont, F.; Queloz, D.; Rauer, H.; Régulo, C.; Renner, S.; Rouan, D.; Samuel, B.; Schneider, J.; Wuchterl, G. (EDP Sciences, 2009)
    Context. CoRoT is a pioneering space mission devoted to the analysis of stellar variability and the photometric detection of extrasolar planets. Aims. We present the list of planetary transit candidates detected in the ...
  • Planetary transit candidates in CoRoT-LRc01 field 

    Cabrera, J.; Fridlund, M.; Ollivier, M.; Gandolfi, D.; Csizmadia, Sz.; Alonso, R.; Aigrain, Suzanne; Alapini, Aude; Almenara, J.-M.; Barge, P.; Bonomo, A. S.; Bordé, P.; Bouchy, F.; Bruntt, H.; Carone, L.; Carpano, S.; Deeg, H. J.; De la Reza, R.; Deleuil, M.; Dvorak, R.; Erikson, A.; Gillon, M.; Gondoin, P.; Guenther, E. W.; Guillot, T.; Hartmann, M.; Hatzes, A.; Hébrard, G.; Jorda, L.; Lammer, H.; Léger, A.; Llebaria, A.; Lovis, C.; Magain, P.; Mayor, M.; Mazeh, T.; Moutou, C.; Ofir, A.; Pätzold, M.; Pepe, F.; Pont, F.; Queloz, D.; Rabus, M.; Rauer, H.; Régulo, C.; Renner, S.; Rouan, D.; Samuel, B.; Santerne, A.; Schneider, J.; Shporer, A.; Stecklum, B.; Tingley, B.; Udry, S.; Wuchterl, G. (EDP Sciences, 2009)
    Aims. We present here the list of planetary transit candidates detected in the first long run observed by CoRoT: LRc01, towards the galactic center in the direction of Aquila, which lasted from May to October 2007. Methods. ...
  • Planetary transit candidates in the CoRoT initial run: resolving their nature 

    Moutou, C.; Pont, F.; Bouchy, F.; Deleuil, M.; Almenara, J.-M.; Alonso, R.; Barbieri, M.; Bruntt, H.; Deeg, H. J.; Fridlund, M.; Gandolfi, D.; Gillon, M.; Guenther, E. W.; Hatzes, A.; Hébrard, G.; Loeillet, B.; Mayor, M.; Mazeh, T.; Queloz, D.; Rabus, M.; Rouan, D.; Shporer, A.; Udry, S.; Aigrain, Suzanne; Auvergne, M.; Baglin, A.; Barge, P.; Benz, W.; Bordé, P.; Carpano, S.; De la Reza, R.; Dvorak, R.; Erikson, A.; Gondoin, P.; Guillot, T.; Jorda, L.; Kabath, P.; Lammer, H.; Léger, A.; Llebaria, A.; Lovis, C.; Magain, P.; Ollivier, M.; Pätzold, M.; Pepe, F.; Rauer, H.; Schneider, J.; Wuchterl, G. (EDP Sciences, 2009)
    With the release of CoRoT lightcurves of the Initial Run IRa01, 50 transiting planetary candidates have been published in a companion paper. About twenty of them were identified as binary stars from the CoRoT lightcurve ...
  • Post-common envelope pre-cataclysmic and cataclysmic variable binaries 

    Sing, David K. (University of Arizona, 2005-12)
    Extensive photometric and spectroscopic observations have been obtained for the binary HS1136+6646, a newly formed post-common envelope binary system containing a hot ∼DAO.5 primary and a highly irradiated secondary. ...
  • Pre-main-sequence variability across the radiative-convective gap 

    Saunders, Eric S.; Naylor, Tim; Mayne, Nathan J.; Littlefair, S.P. (Oxford University Press / Royal Astronomical Society, 2009)
    We use I-band imaging to perform a variability survey of the 13-Myr-old cluster h Per. We find a significant fraction of the cluster members to be variable. Most importantly, we find that variable members lie almost entirely ...