Now showing items 756-775 of 1141

  • Pair states in one-dimensional Dirac systems 

    Hartmann, RR; Portnoi, ME (American Physical Society, 2017-06-13)
    Analytic solutions of the quantum relativistic two-body problem are obtained for an interaction potential modeled as a one-dimensional smooth square well. Both stationary and moving pairs are considered and the limit of ...
  • The Pale Orange Dot: The Spectrum and Habitability of Hazy Archean Earth 

    Arney, G; Domagal-Goldman, SD; Meadows, VS; Wolf, ET; Schwieterman, E; Charnay, B; Claire, M; Hébrard, E; Trainer, MG (Mary Ann Liebert for Astrobiology Society, 2016-10-28)
    Recognizing whether a planet can support life is a primary goal of future exoplanet spectral characterization missions, but past research on habitability assessment has largely ignored the vastly different conditions that ...
  • Particle plasmons: Why shape matters 

    Barnes, WL (American Association of Physics Teachers, 2016-07)
    Simple analytic expressions for the polarizability of metallic nanoparticles are in wide use in the field of plasmonics, but their origins are not obvious. In this article, expressions for the polarizability of a particle ...
  • A path towards understanding the rotation-activity relation of M dwarfs with K2 mission, X-ray and UV data 

    Stelzer, B; Damasso, M; Scholz, A; Matt, SP (Oxford University Press, 2016-08-06)
    We study the relation between stellar rotation and magnetic activity for a sample of 134 bright, nearby M dwarfs observed in the Kepler Two-Wheel (K2) mission during campaigns C0 to C4. The K2 lightcurves yield photometrically ...
  • The PdBI Arcsecond Whirlpool Survey (PAWS): Environmental dependence of giant molecular cloud properties in M51 

    Colombo, D; Hughes, A; Schinnerer, E; Meidt, SE; Leroy, AK; Pety, J; Dobbs, CL; García-Burillo, S; Dumas, G; Thompson, TA; Schuster, KF; Kramer, C (American Astronomical Society / IOP Publishing, 2014-03-20)
    Using data from the PdBI Arcsecond Whirlpool Survey (PAWS), we have generated the largest extragalactic giant molecular cloud (GMC) catalog to date, containing 1507 individual objects. GMCs in the inner M51 disk account ...
  • The PdBI Arcsecond Whirlpool Survey (PAWS): Multi-phase cold gas kinematic of M51 

    Colombo, D; Meidt, SE; Schinnerer, E; García-Burillo, S; Hughes, A; Pety, J; Leroy, AK; Dobbs, CL; Dumas, G; Thompson, TA; Schuster, KF; Kramer, C (American Astronomical Society, 2014-03-20)
    The kinematic complexity and the favorable position of M51 on the sky make this galaxy an ideal target to test different theories of spiral arm dynamics. Taking advantage of the new high-resolution PdBI Arcsecond Whirlpool ...
  • The PdBI Arcsecond Whirlpool Survey (PAWS): The Role of Spiral Arms in Cloud and Star Formation 

    Schinnerer, E; Meidt, SE; Colombo, D; Chandar, R; Dobbs, CL; García-Burillo, S; Hughes, A; Leroy, AK; Pety, J; Querejeta, M; Kramer, C; Schuster, KF (American Astronomical Society / IOP Publishing, 2017-02-08)
    The process that leads to the formation of the bright star-forming sites observed along prominent spiral arms remains elusive. We present results of a multi-wavelength study of a spiral arm segment in the nearby grand-design ...
  • The peculiar debris disk of HD 111520 as resolved by the Gemini Planet Imager 

    Draper, ZH; Duchêne, G; Millar-Blanchaer, MA; Matthews, BC; Wang, JJ; Kalas, P; Graham, JR; Padgett, D; Ammons, SM; Bulger, J; Chen, C; Chilcote, JK; Doyon, R; Fitzgerald, MP; Follette, KB; Gerard, B; Greenbaum, AZ; Hibon, P; Hinkley, S; MacIntosh, B; Ingraham, P; Lafrenière, D; Marchis, F; Marois, C; Nielsen, EL; Oppenheimer, R; Patel, R; Patience, J; Perrin, M; Pueyo, L; Rajan, A; Rameau, J; Sivaramakrishnan, A; Vega, D; Ward-Duong, K; Wolff, SG (American Astronomical Society / IOP Publishing, 2016-07-27)
    Using the Gemini Planet Imager, we have resolved the circumstellar debris disk around HD 111520 at a projected range of ∼30-100 AU in both total and polarized H-band intensity. The disk is seen edge-on at a position angle ...
  • 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 surface wave cloaks. 

    Mitchell-Thomas, R.C.; McManus, TM; Quevedo-Teruel, O; Horsley, S.A.R.; Hao, Y (American Physical Society, 2013-11-22)
    This letter presents a method for making an uneven surface behave as a flat surface. This allows an object to be concealed (cloaked) under an uneven portion of the surface, without disturbing the wave propagation on the ...
  • Perfect transmission through disordered media 

    King, CG; Horsley, SAR; Philbin, TG (American Physical Society, 2017-04-17)
    The transmission of a wave through a randomly chosen `pile of plates' typically decreases expo- nentially with the number of plates, a phenomenon closely related to Anderson localisation. In ap- parent contradiction we ...
  • 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 ...
  • Phenomenological description of the nonlocal magnetization relaxation in magnonics, spintronics, and domain-wall dynamics 

    Wang, W; Dvornik, M; Bisotti, MA; Chernyshenko, D; Beg, M; Albert, M; Vansteenkiste, A; Waeyenberge, BV; Kuchko, AN; Kruglyak, VV; Fangohr, H (American Physical Society, 2015-08-21)
    A phenomenological equation called the Landau-Lifshitz-Baryakhtar (LLBar) [Zh. Eksp. Teor. Fiz 87, 1501 (1984) [Sov. Phys. JETP 60, 863 (1984)]] equation, which could be viewed as the combination of the Landau-Lifshitz ...
  • PHL 1445: An eclipsing cataclysmic variable with a substellar donor near the period minimum 

    McAllister, M.J.; Littlefair, S.P.; Baraffe, I.; Dhillon, V.S.; Marsh, Tom R.; Bento, J.; Bochinski, J.; Bours, MCP; Breedt, E.; Copperwheat, C.M.; Hardy, L.K.; Kerry, P.; Parsons, S.G.; Rostron, J.W.; Sahman, D.I.; Savoury, CDJ; Tunnicliffe, R.L. (Oxford University Press, 2015-03-05)
    We present high-speed, three-colour photometry of the eclipsing dwarf nova PHL 1445, which, with an orbital period of 76.3 min, lies just below the period minimum of ~82 min for cataclysmic variable stars (CVs). Averaging ...
  • Phonon anomalies and superconductivity in the Heusler compound YPd 2Sn 

    Tütüncü, H.M.; Srivastava, G.P. (American Institute of Physics (AIP), 2014-07-07)
    We have studied the structural and electronic properties of YPd 2Sn in the Heusler structure using a generalized gradient approximation of the density functional theory and the ab initio pseudopotential method. The electronic ...