Now showing items 422-441 of 483

  • Temperature dependence of the breakdown of the quantum Hall effect studied by induced currents 

    Matthews, A.J.; Kavokin, K.V.; Usher, Alan; Portnoi, M.E.; Zhu, M.; Gething, J.D.; Elliott, Martin; Herrenden-Harker, W.G.; Phillips, K.; Ritchie, D.A.; Simmons, M.Y.; Sorensen, C.B.; Hansen, O.P.; Mironov, O.A.; Myronov, M.; Leadley, D.R.; Henini, M. (American Physical Society, 2004)
    We have developed a model of the high-current breakdown of the integer quantum Hall effect, as measured in contactless experiments using a highly-sensitive torsion balance magnetometer. The model predicts that, for empirically ...
  • Temperature dependence of the interface moments in Co2MnSi thin films 

    Telling, N.D.; Keatley, Paul Steven; Shelford, L.R.; Arenholz, E.; van der Laan, Gerrit; Hicken, R.J.; Sakuraba, Y.; Tsunegi, S.; Oogane, M.; Ando, Y.; Takanashi, K.; Miyazaki, T. (American Institute of Physics, 2008-05-12)
    X-ray magnetic circular dichroism (XMCD) is utilized to explore the temperature dependence of the interface moments in Co2MnSi (CMS) thin films capped with aluminum. By increasing the thickness of the capping layer, we ...
  • Temperature-dependent resistivity of suspended graphene 

    Mariani, Eros; von Oppen, Felix (American Physical Society, 2010)
    In this paper we investigate the electron-phonon contribution to the resistivity of suspended single layer graphene. In-plane as well as flexural phonons are addressed in different temperature regimes. We focus on the ...
  • Temperature-pressure profile of the hot Jupiter HD 189733b from HST sodium observations: Detection of upper atmospheric heating 

    Huitson, Catherine M.; Sing, David K.; Vidal-Madjar, A.; Ballester, G.; Lecavelier des Etangs, A.; Desert, J.-M.; Pont, F. (Oxford University Press on behalf of the Royal Astronomical Society, 2012)
    We present transmission spectra of the hot Jupiter HD 189733b taken with the Space Telescope Imaging Spectrograph (STIS) aboard Hubble Space Telescope (HST). The spectra cover the wavelength range 5808–6380 Å with a resolving ...
  • Temporal variations in the evaporating atmosphere of the exoplanet HD 189733b 

    Lecavelier des Etangs, A.; Bourrier, V.; Wheatley, P.J.; Dupuy, H.; Ehrenreich, D.; Vidal-Madjar, A.; Hebrard, G.; Ballester, G.; Desert, J.-M.; Ferlet, R.; Sing, David K. (EDP Sciences for European Southern Observatory (ESO), 2012)
    Atmospheric escape has been detected from the exoplanet HD 209458b through transit observations of the hydrogen Lyman-α line. Here we present spectrally resolved Lyman-α transit observations of the exoplanet HD 189733b at ...
  • Terahertz applications of carbon nanotubes 

    Portnoi, M.E.; Kibis, O.V.; Rosenau da Costa, M. (Elsevier, 2008)
    We formulate and justify several proposals utilizing unique electronic properties of carbon nanotubes for a broad range of applications to THz optoelectronics, including THz generation by hot electrons in quasi-metallic ...
  • Terahertz emission spectroscopy of laser-induced spin dynamics in TmFeO3 and ErFeO3 orthoferrites 

    Mikhaylovskiy, Rostislav; Hendry, Euan; Kruglyak, V.V.; Pisarev, R.V.; Rasing, T.; Kimel, A.V. (American Physical Society, 2014)
    Using the examples of laser-induced spin-reorientation phase transitions in TmFeO3 and ErFeO3 orthoferrites, we demonstrate that terahertz emission spectroscopy can obtain novel information about ultrafast laser-induced ...
  • Terahertz processes in carbon nanotubes 

    Batrakov, K.G.; Kibis, O.V.; Kuzhir, P.P.; Rosenau da Costa, M.; Portnoi, M.E. (SPIE - Society of Photo-Optical Instrumentation Engineers, 2010)
    We investigated several proposals utilizing the unique electronic properties of carbon nanotubes (CNTs) for a broad range of applications to THz optoelectronics, including THz generation by Cerenkov-type emitters based on ...
  • Terahertz science and technology of carbon nanomaterials 

    Hartmann, Richard R.; Kono, J.; Portnoi, M.E. (IOP Publishing, 2014)
    The diverse applications of terahertz (THz) radiation and its importance to fundamental science makes finding ways to generate, manipulate and detect THz radiation one of the key areas of modern applied physics. One approach ...
  • Theory of anyon excitons: Relation to excitons of nu =1/3 and nu =2/3 incompressible liquids 

    Portnoi, M.E.; Rashba, E.I. (American Physical Society, 1996)
    Elementary excitations of incompressible quantum liquids (IQL’s) are anyons, i.e., quasiparticles carrying fractional charges and obeying fractional statistics. To find out how the properties of these exotic quasiparticles ...
  • Theory of ferromagnetic microswimmers 

    Gilbert, Andrew D.; Ogrin, Feodor Y.; Petrov, Peter G.; Winlove, C. Peter (Oxford University Press, 2011)
    This paper considers the dynamics of a microscale swimmer based on two magnetic beads that are elastically coupled together. A time-varying external magnetic field is imposed that has two principal effects: one is to exert ...
  • Thin metamaterial Luneburg lens for surface waves 

    Dockrey, J.A.; Lockyear, Matthew J.; Berry, S.J.; Horsley, S.A.R.; Sambles, J. Roy; Hibbins, Alastair P. (American Physical Society, 2013)
    By suitably patterning a metasurface, the phase velocity of surface waves may be manipulated. Here, a low-loss, thin (1/14th of the free-space wavelength), omnidirectional Luneburg lens, based upon a Sievenpiper “mushroom” ...
  • Thin resonant structures for angle and polarization independent microwave absorption 

    Lockyear, Matthew J.; Hibbins, Alastair P.; Sambles, J. Roy; Hobson, Peter A.; Lawrence, Christopher R. (American Institute of Physics, 2009)
    We present a microwave absorbing structure comprised of an array of subwavelength radius copper disks, closely spaced from a ground plane by a low loss dielectric. Experiments and accompanying modeling demonstrate that ...
  • Thoughts of a design team: Barriers to low carbon school design 

    Kershaw, Tristan; Simm, Stephen (Elsevier, 2014)
    With the increasing threat of serious climate change, various governments are aiming to substantially reduce their carbon emissions. In the UK all new schools and domestic buildings are required to be ‘zero-carbon’ from ...
  • Time resolved studies of edge modes in magnetic nanoelements (invited) 

    Kruglyak, V.V.; Keatley, Paul Steven; Hicken, R.J.; Childress, J.R.; Katine, J.A. (American Institute of Physics, 2006)
    Micromagnetic simulations have been performed to investigate the frequencies and relative amplitudes of resonant magnetic modes within nanomagnetic elements of varying size that have been previously studied by time resolved ...
  • Time- and vector-resolved Kerr microscopy of hard disk writers 

    Gangmei, Prim; Keatley, Paul Steven; Yu, W.; Hicken, R.J.; Gubbins, M.A.; Czoschke, P.J.; Lopusnik, R. (American Institute of Physics, 2011)
    Time-resolved scanning Kerr microscopy has been used to make wafer level measurements of magnetization dynamics within the yoke and pole piece of partially built hard disk writer structures. Three Cartesian components of ...
  • Time- and vector-resolved magneto-optical Kerr effect measurements of large angle precessional reorientation in a 2×2 μ m2 ferromagnet 

    Keatley, Paul Steven; Kruglyak, V.V.; Neudert, A.; Delchini, M.; Hicken, R.J.; Childress, J.R.; Katine, J.A. (American Institute of Physics, 2009)
    The precessional dynamics of a 2×2 μm2 CoFe/NiFe (4.6 nm) element stimulated by an in-plane pulsed magnetic field have been investigated using time- and vector-resolved Kerr microscopy measurements and micromagnetic ...
  • Time-resolved investigation of magnetization dynamics of arrays of nonellipsoidal nanomagnets with nonuniform ground states 

    Keatley, Paul Steven; Kruglyak, V.V.; Neudert, A.; Galaktionov, E.A.; Hicken, R.J.; Childress, J.R.; Katine, J.A. (American Physical Society, 2008)
    Time-resolved scanning Kerr microscopy measurements have been performed upon arrays of square ferromagnetic nanoelements of different sizes and for a range of bias fields. The experimental results were compared to micromagnetic ...
  • Time-resolved sign-dependent switching in a hybrid aligned nematic liquid crystal cell 

    Taphouse, T. S.; Cornford, Stephen Leslie; Birkett, J. E.; Sambles, J. Roy (Institute of Physics and Deutsche Physikalische Gesellschaft, 2008)
    An optical waveguide technique is used to determine the director tilt profile across a hybrid aligned nematic (HAN) liquid crystal cell, in which the optical response is dependent on the sign of the applied voltage. Two ...
  • TiO and VO broad band absorption features in the optical spectrum of the atmosphere of the hot-Jupiter HD 209458b 

    Desert, J.-M.; Vidal-Madjar, A.; Lecavelier des Etangs, A.; Sing, David K.; Ehrenreich, D.; Hebrard, G.; Ferlet, R. (EDP Sciences for European Southern Observatory (ESO), 2008)
    Aims. The presence of titanium oxide (TiO) and vanadium oxide (VO) gas phase species is searched for in the atmosphere of the hot Jupiter HD 209458b . Methods. We compared a model for the planet's transmitted spectrum to ...