Now showing items 1-20 of 91

  • A 220 GHz 3D imaging radar with sub-cm3 voxel resolution for security applications 

    Robertson, Duncan Alexander; MacFarlane, David Graham; Bryllert, Tomas (IEEE, 2017-01-19) - Conference item
    Radars operating at high millimetre and sub-millimetre wave frequencies are promising candidates for security applications such as people screening since they offer the possibility to form 3D images through clothing with ...
  • 220GHz wideband 3D imaging radar for concealed object detection technology development and phenomenology studies 

    Robertson, Duncan Alexander; Macfarlane, David Graham; Bryllert, Tomas (SPIE, 2016-05-12) - Conference item
    We present a 220 GHz 3D imaging ‘Pathfinder’ radar developed within the EU FP7 project CONSORTIS (Concealed Object Stand-Off Real-Time Imaging for Security) which has been built to address two objectives: (i) to de-risk ...
  • 94 GHz pulsed coherent radar for high power amplifier evaluation 

    Robertson, Duncan Alexander; Hunter, Robert Iain; Gallacher, Thomas (SPIE, 2016-05-12) - Conference item
    We present the design and characterization of a 94 GHz pulsed coherent radar to be used for the evaluation and demonstration of novel wideband, high power vacuum tube amplifier technology. The radar is designed to be fully ...
  • Absence of giant spin splitting in the two-dimensional electron liquid at the surface of SrTiO3 (001) 

    McKeown Walker, S; Riccò, S; Bruno, F Y; de la Torre, A; Tamai, A; Golias, E; Varykhalov, A; Marchenko, D; Hoesch, M; Bahramy, M S; King, Philip David; Sánchez-Barriga, J; Baumberger, F (2016-06-22) - Journal article
    We reinvestigate the putative giant spin splitting at the surface of SrTiO3 reported by Santander-Syro et al. [Nature Mat. 13, 1085 (2014)]. Our spin- and angle-resolved photoemission experiments on fractured (001) oriented ...
  • Application of SQUIDs to low temperature and high magnetic field measurements—ultra low noise torque magnetometry 

    Arnold, F.; Naumann, M.; Lühmann, Th.; Mackenzie, A. P.; Hassinger, E. (2018-02) - Journal article
    Torque magnetometry is a key method to measure the magnetic anisotropy and quantum oscillations in metals. In order to resolve quantum oscillations in sub-millimeter sized samples, piezo-electric micro-cantilevers were ...
  • Breaking Lorentz reciprocity to overcome the time-bandwidth limit in physics and engineering 

    Tsakmakidis, K. L.; Shen, L.; Schulz, S. A.; Zheng, X.; Upham, J.; Deng, X.; Altug, H.; Vakakis, A. F.; Boyd, R. W. (2017-06-23) - Journal article
    A century-old tenet in physics and engineering asserts that any type of system, having bandwidth Δω, can interact with a wave over only a constrained time period Δt inversely proportional to the bandwidth (Δt·Δω ~ 2π). ...
  • Can quantum gas microscopes directly image exotic glassy phases? 

    Thomson, Steven John; Walker, Liam S.; Harte, Tiffany L.; Bruce, Graham David (2016-08-30) - Conference poster
    With the advent of spatially resolved fluorescence imaging in quantum gas microscopes (see e.g. [1]), it is now possible to directly image glassy phases and probe the local effects of disorder in a highly controllable ...
  • Can topological transitions be exploited to engineer intrinsically quench-resistant wires? 

    Whittlesea, Philip; Quintanilla, Jorge; Annett, James F.; Hillier, Adrian D.; Hooley, Chris (2018-06-01) - Journal article
    In this paper, we investigate whether by synthesizing superconductors that are tuned to a topological, node-reconstruction transition point, we could create superconducting wires that are intrinsically resilient to quenches. ...
  • Client-side energy costs of video streaming 

    Ejembi, Oche; Bhatti, Saleem N. (Institute of Electrical and Electronics Engineers Inc., 2016-02-01) - Conference item
    Through measurements on our testbed, we show how users of Netflix could make energy savings of up to 34% by adjusting video quality settings. We estimate the impacts of these quality settings on the energy consumption of ...
  • Coherence protection in coupled quantum systems 

    Cammack, Helen Mary; Kirton, Peter George; Stace, Thomas; Eastham, Paul; Keeling, Jonathan Mark James; Lovett, Brendon William (2018-02) - Journal article
    The interaction of a quantum system with its environment causes decoherence, setting a fundamental limit on its suitability for quantum information processing. However, we show that if the system consists of coupled parts ...
  • Colloidal nanocrystals : electrifying quantum dots for lasers 

    Samuel, Ifor David William (2018-01) - Journal item
  • Control of Q-factor in nanobeam cavities on substrate 

    Panettieri, Danilo; O'Faolain, Liam; Grande, Marco (IEEE, 2016-08-23) - Conference item
    In this paper, we demonstrate how to efficiently control the quality factor of silicon nitride nanobeam cavities, grown on a silica substrate and embedded in an upper cladding, by engineering the nanobeam cross-section and ...
  • Controlling the gain contribution of background emitters in few-quantum-dot microlasers 

    Gericke, F; Segnon, M; von Helversen, M.M.; Hopfmann, M; Heindel, T; Schneider, C; Höfling, Sven; Kamp, M; Musiał, A; Porte, X; Gies, C; Reitzenstein, S (2018-02) - Journal article
    We provide experimental and theoretical insight into single-emitter lasing effects in a quantum dot (QD)-microlaser under controlled variation of background gain provided by off-resonant discrete gain centers. For that ...
  • Correct Brillouin zone and electronic structure of BiPd 

    Yaresko, Alexander; Schnyder, Andreas P.; Benia, Hadj M.; Yim, Chi-Ming; Levy, Giorgio; Damascelli, Andrea; Ast, Christian R.; Peets, Darren C.; Wahl, Peter (2018-02-15) - Journal article
    A promising route to the realization of Majorana fermions is in noncentrosymmetric superconductors, in which spin-orbit coupling lifts the spin degeneracy of both bulk and surface bands. A detailed assessment of the ...
  • Crossover from lattice to plasmonic polarons of a spin-polarised electron gas in ferromagnetic EuO 

    Riley, Jonathon Mark; Caruso, F; Verdi, C; Duffy, L; Watson, Matthew David; Bawden, Lewis; Volckaert, K; van der Laan, G; Hesjedal, T; Hoesch, M; Giustino, F; King, Philip David (2018-06-13) - Journal article
    Strong many-body interactions in solids yield a host of fascinating and potentially useful physical properties. Here, from angle-resolved photoemission experiments and ab-initio many-body calculations, we demonstrate how ...
  • Cryogenic STM in 3D vector magnetic fields realized through a rotatable insert 

    Trainer, Christopher William James; Yim, Chi Ming; McLaren, Martin; Wahl, Peter (2017-09) - Journal article
    Spin-polarized scanning tunneling microscopy (SP-STM) performed in vector magnetic fields promises atomic scale imaging of magnetic structure, providing complete information on the local spin texture of a sample in three ...
  • Current status of outdoor lifetime testing of organic photovoltaics 

    Zhang, Yiwei; Samuel, Ifor D. W.; Wang, Tao; Lidzey, David G. (2018-06-10) - Journal item
    Performance degradation is one of the key obstacles limiting the commercial application of organic photovoltaic (OPV) devices. The assessment of OPV stability and lifetime are usually based on simulated degradation experiments ...
  • Designing spin-channel geometries for entanglement distribution 

    Levi, Elliott Kendrick; Kirton, Peter George; Lovett, Brendon William (2016-09-01) - Journal article
    We investigate different geometries of spin-1/2 nitrogen impurity channels for distributing entanglement between pairs of remote nitrogen vacancy centers (NVs) in diamond. To go beyond the system size limits imposed by ...
  • Development and testing of impregnated La0.20Sr0.25Ca0.45TiO3 anode microstructures for solid oxide fuel cells 

    Price, Robert; Cassidy, Mark; Schuler, J. Andreas; Mai, Andreas; Irvine, John T. S. (Electrochemical Society, 2017) - Conference item
    The A-site deficient perovskite: La0.20Sr0.25Ca0.45TiO3 (LSCTA-) is a mixed ionic and electronic conductor (MIEC) which shows promising performance as a Solid Oxide Fuel Cell (SOFC) anode ‘backbone’ material, when impregnated ...
  • Dissipatively coupled waveguide networks for coherent diffusive photonics 

    Mukherjee, Sebabrata; Mogilevtsev, Dmitri; Slepyan, Gregory Ya.; Doherty, Thomas H.; Thomson, Robert R.; Korolkova, Natalia (2017-12-04) - Journal article
    A photonic circuit is generally described as a structure in which light propagates by unitary exchange and transfers reversibly between channels. In contrast, the term ‘diffusive’ is more akin to a chaotic propagation in ...