Now showing items 306-325 of 459

  • Quantum dynamics of the damped harmonic oscillator 

    Philbin, Thomas G. (Institute of Physics, 2012)
    The quantum theory of the damped harmonic oscillator has been a subject of continual investigation since the 1930s. The obstacle to quantization created by the dissipation of energy is usually dealt with by including a ...
  • Quantum Hall induced currents and the magnetoresistance of a quantum point contact 

    Smith, Martin J.; Williams, Charles D.H.; Shytov, A.V.; Usher, Alan; Sachrajda, A.S.; Kam, A.; Wasilewski, Z.R. (Institute of Physics, 2011)
    We report measurements of quantum Hall induced currents from their magnetisation and from their effect on the conductance of a quantum point contact. Features in the magnetic moment and QPC resistance are correlated at ...
  • Quantum levitation by left-handed metamaterials 

    Leonhardt, Ulf; Philbin, Thomas G. (Institute of Physics, 2007)
    Left-handed metamaterials make perfect lenses that image classical electromagnetic fields with significantly higher resolution than the diffraction limit. Here we consider the quantum physics of such devices. We show that ...
  • Quantum optics of spatial transformation media 

    Leonhardt, Ulf; Philbin, Thomas G. (Institute of Physics / European Optical Society, 2007)
    Transformation media are at the heart of invisibility devices, perfect lenses and artificial black holes. In this paper, we consider their quantum theory. We show how transformation media map quantum electromagnetism in ...
  • Quasi-exact solution to the Dirac equation for the hyperbolic-secant potential 

    Hartmann, Richard R.; Portnoi, M.E. (American Physical Society, 2014)
    We analyze bound modes of two-dimensional massless Dirac fermions confined within a hyperbolic secant potential, which provides a good fit for potential profiles of existing top-gated graphene structures. We show that bound ...
  • Radiation damping in atomic photonic crystals 

    Horsley, S.A.R.; Artoni, M.; La Rocca, G.C. (American Physical Society, 2011)
    The force exerted on a material by an incident beam of light is dependent upon the material’s velocity in the laboratory frame of reference. This velocity dependence is known to be difficult to measure, as it is proportional ...
  • Radiation damping optical enhancement in cold atoms 

    Wu, Jin-Hui; Horsley, S.A.R.; Artoni, M.; La Rocca, G.C. (Nature Publishing Group, 2013)
    The typically tiny effect of radiation damping on a moving body can be amplified to a favorable extent by exploiting the sharp reflectivity slope at one edge of an optically induced stop-band in atoms loaded into an optical ...
  • Radiation pressure in stratified moving media 

    Horsley, S.A.R.; Artoni, M.; La Rocca, G.C. (American Physical Society, 2012)
    A general theory of optical forces on moving bodies is here developed in terms of generalized 4×4 transfer and scattering matrices. Results are presented for a planar dielectric of arbitrary refractive index placed in an ...
  • Radiation pressure on a moving body: Beyond the Doppler effect 

    Horsley, S.A.R.; Artoni, M.; La Rocca, G.C. (Optical Society of America, 2012)
    The dependence of macroscopic radiation pressure on the velocity of the object being pushed is commonly attributed to the Doppler effect. This need not be the case, and here we highlight velocity-dependent radiation pressure ...
  • Rapid switching in a dual-frequency hybrid aligned nematic liquid crystal cell 

    Jewell, Sharon A.; Taphouse, T. S.; Sambles, J. Roy (American Institute of Physics, 2005)
    We report the optical characterization of a dual-frequency hybrid aligned nematic (HAN) liquid crystal cell driven between two states using a multiple-frequency sinusoidal pulse. The complex dynamic director structure ...
  • Rate and nature of false positives in the CoRoT exoplanet search 

    Almenara, J.-M.; Deeg, H. J.; Aigrain, Suzanne; Alonso, R.; Auvergne, M.; Baglin, A.; Barbieri, M.; Barge, P.; Bordé, P.; Bouchy, F.; Bruntt, H.; Cabrera, J.; Carone, L.; Carpano, S.; Catala, C.; Csizmadia, Sz.; De la Reza, R.; Deleuil, M.; Dvorak, R.; Erikson, A.; Fridlund, M.; Gandolfi, D.; Gillon, M.; Gondoin, P.; Guenther, E. W.; Guillot, T.; Hatzes, A.; Hébrard, G.; Jorda, L.; Lammer, H.; Léger, A.; Llebaria, A.; Loeillet, B.; Magain, P.; Mayor, M.; Mazeh, T.; Moutou, C.; Ollivier, M.; Pätzold, M.; Pont, F.; Queloz, D.; Rauer, H.; Régulo, C.; Renner, S.; Rouan, D.; Samuel, B.; Schneider, J.; Shporer, A.; Wuchterl, G.; Zucker, S. (EDP Sciences, 2009)
    Context. The CoRoT satellite searches for planets by applying the transit method, monitoring up to 12,000 stars in the galactic plane for 150 days in each observing run. This search is contaminated by a large fraction of ...
  • Rayleigh scattering by H2 in the extrasolar planet HD 209458b 

    Lecavelier des Etangs, A.; Vidal-Madjar, A.; Desert, J.-M.; Sing, David K. (EDP Sciences for European Southern Observatory (ESO), 2008)
    Transiting planets, such as HD 209458b, offer a unique opportunity to scrutinize the planetary atmospheric content. Although molecular hydrogen is expected to be the main atmospheric constituent, H2 remains uncovered ...
  • Rayleigh scattering in the transit spectrum of HD 189733b 

    Lecavelier des Etangs, A.; Pont, F.; Vidal-Madjar, A.; Sing, David K. (EDP Sciences for European Southern Observatory (ESO), 2008)
    The transit spectrum of the exoplanet HD 189733b has recently been obtained between 0.55 and 1.05 m. Here we present an analysis of this spectrum. We develop first-order equations to interpret absorption spectra. In the ...
  • Red blood cell thermal fluctuations: comparison between experiment and molecular dynamics simulations 

    Hale, John P.; Marcelli, Gianluca; Parker, Kim H.; Winlove, C. Peter; Petrov, Peter G. (Royal Society of Chemistry, 2009)
    We outline a new method of analysis of thermal shape fluctuations of red blood cells, based on comparison between experiments and coarse-grained molecular dynamics simulations. The fluctuations of 2D equatorial contours ...
  • Reduction of carrier mobility in semiconductors caused by charge-charge interactions 

    Hendry, Euan; Koeberg, Mattijs; Pijpers, J.; Bonn, Mischa (American Physical Society, 2007)
    We investigate the effect of charge-charge interactions on carrier mobility in titanium dioxide (TiO2) and silicon (Si) using terahertz spectroscopy. Charge scattering times and plasma frequencies are directly determined ...
  • Relationship between photonic band structure and emission characteristics of a polymer distributed feedback laser 

    Turnbull, G. A.; Andrew, P.; Jory, M. J.; Barnes, William L.; Samuel, I. D. W. (American Physical Society, 2001)
    We present an experimental study of the emission characteristics and photonic band structure of a distributed feedback polymer laser, based on the material poly[2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylene vinylene]. We ...
  • Remarkable transmission of microwaves through a wall of long metallic bricks 

    Hibbins, Alastair P.; Sambles, J. Roy; Lawrence, Christopher R.; Robinson, Donna M. (American Institute of Physics, 2001)
    The transmitted intensity of a microwave beam through a thick continuous metal wall will be effectively zero due to the almost complete exclusion of the electric field from the metal. However, it is shown here that by ...
  • Remarkable Zeroth-Order Resonant Transmission of Microwaves through a Single Subwavelength Metal Slit 

    Suckling, James R.; Sambles, J. Roy; Lawrence, Christopher R. (American Physical Society, 2005)
    A slit in a thick metal plate that is extremely subwavelength will not transmit microwaves polarized parallel to it. It is shown here that cuts perpendicular to the slit allow parallel polarized radiation to resonantly ...
  • Removing singular refractive indices with sculpted surfaces 

    Quevedo-Teruel, O; Horsley, S.A.R.; Hooper, Ian R.; Mitchell-Thomas, R.C. (Nature Publishing Group, 2014)
    The advent of Transformation Optics established the link between geometry and material properties, and has resulted in a degree of control over electromagnetic fields that was previously impossible. For waves confined to ...
  • Removing systematics from the CoRoT light curves. I. Magnitude-dependent zero point 

    Mazeh, T.; Guterman, P.; Aigrain, Suzanne; Zucker, S.; Grinberg, N.; Alapini, Aude; Alonso, R.; Auvergne, M.; Barbieri, M.; Barge, P.; Bordé, P.; Bouchy, F.; Deeg, H. J.; De la Reza, R.; Deleuil, M.; Dvorak, R.; Erikson, A.; Fridlund, M.; Gondoin, P.; Jorda, L.; Lammer, H.; Léger, A.; Llebaria, A.; Magain, P.; Moutou, C.; Ollivier, M.; Pätzold, M.; Pont, F.; Queloz, D.; Rauer, H.; Rouan, D.; Sabo, R.; Schneider, J.; Wuchterl, G. (EDP Sciences, 2009)
    This paper presents an analysis that searched for systematic effects within the CoRoT exoplanet field light curves. The analysis identified a systematic effect that modified the zero point of most CoRoT exposures as a ...