Now showing items 2128-2147 of 8164

  • Electrical transport properties of URhGe and BiPd at very low temperature 

    Barraclough, Jack Matthew (University of St Andrews, 2015-06-24) - Thesis
    URhGe has garnered interest recently as one of the few known ferromagnetic superconductors. The superconductivity in this material appears to arise from magnetic fluctuations rather than phonons, and take a triplet form ...
  • An electrically driven cavity-enhanced source of indistinguishable photons with 61% overall efficiency 

    Schlehahn, A.; Thoma, A.; Munnelly, P.; Kamp, M.; Höfling, Sven; Heindel, T.; Schneider, C.; Reitzenstein, S. (2016-04-18) - Journal article
    We report on an electrically driven efficient source of indistinguishable photons operated at pulse-repetition rates f up to 1.2 GHz. The quantum light source is based on a p-i-n-doped micropillar cavity with integrated ...
  • Electrically injected photonic-crystal nanocavities 

    Welna, Karl (University of St Andrews, 2011-11-30) - Thesis
    Nano-emitters are the new generation of laser devices. A photonic-crystal cavity, which highly confines light in small volumes, in combination with quantum-dots can enhance the efficiency and lower the threshold of this ...
  • Electrically-controlled rapid femtosecond pulse duration switching and continuous picosecond pulse duration tuning in an ultrafast Cr4+:forsterite laser 

    Crombie, C.; Walsh, D. A.; Lu, W.; Zhang, S.; Zhang, Z.; Kennedy, K.; Calvez, S.; Sibbett, W.; Brown, C. T. A. (2012-07-30) - Journal article
    We demonstrate rapid switching between picosecond and femtosecond operational regimes in a Cr4+:forsterite laser, using an electrically-contacted GaInNAs SESAM with saturable absorption characteristics controlled via the ...
  • Electro optical tuning of Tamm-plasmon exciton-polaritons 

    Gessler, J.; Baumann, V.; Emmerling, M.; Amthor, M.; Winkler, K.; Höfling, S.; Schneider, C.; Kamp, M. (2014-11-03) - Journal article
    We report on electro optical tuning of the emission from GaAs quantum wells resonantly coupled to a Tamm-plasmon mode in a hybrid metal/dielectric structure. The structures were studied via momentum resolved photoluminescence ...
  • Electro-photo-sensitive memristor for neuromorphic and arithmetic computing 

    Maier, P.; Hartmann, F.; Emmerling, M.; Schneider, C.; Kamp, M.; Höfling, S.; Worschech, L. (2016-05-17) - Journal article
    We present optically and electrically tunable conductance modifications of a site-controlled quantum-dot memristor. The conductance of the device is tuned by electron localization on a quantum dot. The control of the ...
  • Electrochemical impedance spectroscopy investigation of the anodic functionalities and processes in LSCM-CGO-Ni systems 

    Boulfrad, Samir; Nechache, A.; Cassidy, Mark; Traversa, E.; Irvine, John Thomas Sirr (Electrochemical Society, 2015) - Conference item
    Electrochemical impedance spectroscopy was used to characterize anode compositions made of (La0.75Sr0.25)0.97Cr0.5Mn0.5O3 (LSCM) and gadolinia doped ceria (CGO) with and without additional submicron Ni, or exsoluted Ni ...
  • Electrochemical metal deposition controlled by molecular assemblies 

    Bartoletti, Enrico (University of St Andrews, 2015-09-24) - Thesis
    This thesis studies the electrochemical deposition of the metals Pd and Cu on self-assembled monolayers (SAMs) formed on Au substrates. The SAMs are composed of aromatic mercaptans like 4,4′-dipyridyl disulfide or ...
  • Electrochemically informed synthesis : oxidation versus coordination of 5,6-Bis(phenylchalcogeno)acenaphthenes 

    Knight, Fergus Ross; Randall, Rebecca Amy Michele; Roemmele, Tracey L.; Boeré, René T.; Bode, Bela Ernest; Crawford, Luke; Buehl, Michael; Slawin, Alexandra Martha Zoya; Woollins, J Derek (2013-10-07) - Journal article
  • Electroluminescence from spatially confined exciton polaritons in a textured microcavity 

    Winkler, K.; Schneider, C.; Fischer, J.; Rahimi-Iman, A.; Amthor, M.; Forchel, A.; Reitzenstein, S.; Höfling, Sven; Kamp, M. (2013-01-28) - Journal article
    We report on the formation of spatially confined exciton-polaritons under electrical injection in a textured microcavity. The trapping of polaritons in the diode sample is achieved through a locally elongated GaAs microcavity ...
  • Electron acceleration above thunderclouds 

    Fuellekrug, Martin; Kolmasova, Ivana; Santolik, Ondrej; Farges, Thomas; Bor, Jozsef; Bennett, Alec; Parrot, Michel; Rison, William; Zanotti, Ferruccio; Arnone, Enrico; Mezentsev, Andrew; Lan, Radek; Uhlir, Ludek; Harrison, Giles; Soula, Serge; van der Velde, Oscar; Pincon, Jean-Louis; Helling, Christiane; Diver, Declan (2013-08-13) - Journal article
    The acceleration of electrons results in observable electromagnetic waves which can be used for remote sensing. Here, we make use of similar to 4 Hz-66 MHz radio waves emitted by two consecutive intense positive lightning ...
  • Electron cyclotron heating and current drive using the electron Bernstein modes 

    McGregor, Duncan Ekundayo (University of St Andrews, 2007) - Thesis
    Electron Bernstein waves are a mode of oscillation in a plasma, thought a candidate for providing radiofrequency heating and non-inductive current drive in spherical tokamaks. Previous studies of these modes have relied ...
  • Electron microscopic studies of growth of nanoscale catalysts and soot particles in a candle flame 

    Zhou, Wuzong; Yu, Fengjiao; Greer, Heather Frances; Jiang, Zheng; Edwards, Peter P. (2012-09) - Journal article
    Scanning electron microscopy and high-resolution transmission electron microscopy have been used to investigate non-classic crystal growth of catalytic nanoparticles, such as zeolites, perovskites, metal and alloy particles. ...
  • Electron microscopy of crystalline solids and non-classical crystal growth 

    Greer, Heather F. (University of St Andrews, 2013-11-29) - Thesis
    This project concerns the non-classical crystal growth of various porous and non-porous materials. In order to determine their crystal growth mechanism, the reaction was stopped at several different reaction times with the ...
  • Electron mobility in CdO films 

    Farahani, S. K. Vasheghani; Veal, T. D.; King, P. D. C.; Zuniga-Perez, J.; Munoz-Sanjose, V.; McConville, C. F. (2011-04) - Journal article
    Electron mobility in degenerate CdO thin films has been studied as a function of carrier concentration. The "optical" mobility has been determined from infrared reflectance measurements of the conduction band plasmon ...
  • Electron-beam driven relaxation oscillations in ferroelectric nanodisks 

    Ng, N.; Ahluwalia, R.; Kumar, A.; Srolovitz, D.J.; Chandra, P.; Scott, James Floyd (2015-10-12) - Journal article
    Using a combination of computational simulations, atomic-scale resolution imaging and phenomenological modelling, we examine the underlying mechanism for nanodomain restructuring in lead zirconate titanate nanodisks driven ...
  • Electron-beam patterned self-assembled monolayers as templates for Cu electrodeposition and lift-off 

    She, Zhe; Di Falco, Andrea; Hähner, Georg; Buck, Manfred (2012-02-06) - Journal article
    Self-assembled monolayers (SAMs) of 4'-methylbiphenyl-4-thiol (MBP0) adsorbed on polycrystalline gold substrates served as templates to control electrochemical deposition of Cu structures from acidic solution, and enabled ...
  • Electronic and optical SESAM control in Cr⁴⁺:forsterite lasers 

    Crombie, Christine (University of St Andrews, 2013) - Thesis
    The work documented in this thesis is based on the production, manipulation and control of ultrashort laser pulses in the near infra-red region of the electromagnetic spectrum. Pulses were created using Cr⁴⁺:Forsterite as ...
  • Electronic structure of the cuprate superconducting and pseudogap phases from spectroscopic imaging STM 

    Schmidt, A. R.; Fujita, K.; Kim, E-A; Lawler, M. J.; Eisaki, H.; Uchida, S.; Lee, D-H; Davis, J. C. (2011-06-21) - Journal article
    We survey the use of spectroscopic imaging scanning tunneling microscopy (SI-STM) to probe the electronic structure of underdoped cuprates. Two distinct classes of electronic states are observed in both the d-wave ...
  • The electronic structure of the nematic materials Sr₃Ru₂O₇ and Ca(Co[subscript(x)]Fe[subscript(1-x)])₂As₂ 

    Allan, Milan P. (University of St Andrews, 2010-11-22) - Thesis
    We investigated the electronic structure of the two nematic materials Sr₃Ru₂O₇ and Ca(Fe₀.₉₇Co₀.₀₃As)₂ using spectroscopic – imaging scanning tunneling microscopy (SI-STM) and angle resolved photoemission spectroscopy ...