Auflistung nach Schlagwort "Electrons"

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  • Aharonov-Bohm effect in an electron-hole graphene ring system 
    Smirnov, D.; Schmidt, H.; Haug, Rolf J. (College Park, MD : American Institute of Physics, 2012)
    Aharonov-Bohm oscillations are observed in a graphene quantum ring with a topgate covering one arm of the ring. As graphene is a gapless semiconductor, this geometry allows to study not only the quantum interference of ...
  • Beam extraction using non vacuum electron beam by reduced acceleration voltage 
    Hassel, T.; Klimov, G.; Beniyash, A. (Bristol : Institute of Physics Publishing, 2018)
    One of the disadvantages of the non-vacuum electron beam (NVEB) systems is a high acceleration voltage, which leads to an increase of defence against X-ray radiation. Due to the reduced acceleration voltage. On the one ...
  • Boosting terahertz generation in laser-field ionized gases using a sawtooth wave shape 
    Martínez, P.G.D.A.; Babushkin, I.; Bergé, L.; Skupin, S.; Cabrera-Granado, E.; Köhler, C.; Morgner, Uwe; Husakou, A.; Herrmann, J. (American Physical Society, 2015)
    Broadband ultrashort terahertz (THz) pulses can be produced using plasma generation in a noble gas ionized by femtosecond two-color pulses. Here we demonstrate that, by using multiple-frequency laser pulses, one can obtain ...
  • Controlled emission time statistics of a dynamic single-electron transistor 
    Brange, Fredrik; Schmidt, Adrian; Bayer, Johannes C.; Wagner, Timo; Flindt, Christian; Haug, Rolf J. (Washington : American Association for the Advancement of Science (A A A S), 2021)
    Quantum technologies involving qubit measurements based on electronic interferometers rely critically on accurate single-particle emission. However, achieving precisely timed operations requires exquisite control of the ...
  • Evaluating carbon dots as electron mediators in photochemical and photocatalytic processes of NiFe2O4 
    Ombaka, Lucy M.; Dillert, Ralf; Robben, Lars; Bahnemann, Detlef W. (College Park : American Institute of Physics, 2020)
    Spinel ferrites such as nickel ferrite are promising energy conversion photocatalysts as they are visible-light absorbers, chemically stable, earth abundant, and inexpensive. Nickel ferrite shows poor photocatalytic activity ...
  • Ferrocene-1,1' -dithiol as molecular wire between Ag electrodes: The role of surface defects 
    Bredow, T.; Tegenkamp, Christoph; Pfnür, Herbert; Meyer, J.; Maslyuk, V.V.; Mertig, I. (College Park, MD : American Institute of Physics, 2008)
    The interaction of ferrocene- 1, 1' -dithiol (FDT) with two parallel Ag(111) surfaces has been theoretically studied at density-functional level. The effect of surface defects on the energetic and electronic structure was ...
  • Graphitization process of SiC(0001) studied by electron energy loss spectroscopy 
    Langer, T.; Pfnür, Herbert; Schumacher, H.W.; Tegenkamp, Christoph (College Park, MD : American Institute of Physics, 2009)
    Electron energy loss spectroscopy (EELS) is used to study the transition from the buffer layer to the first graphene layers during graphitization of SiC(0001). Graphene growth is controlled and correlated with spot profile ...
  • High frequency conductivity in the quantum Hall regime 
    Hohls, Frank; Zeitler, U.; Haug, Rolf J. (College Park, MD : American Physical Society, 2001)
    The frequency dependence of the longitudinal conductivity σxx for frequencies up to 6 GHz was measured. It was possible to access both the real part and the imaginary part of σxx which allowed to perform a new test of ...
  • Hopping conductivity in the quantum Hall effect: Revival of universal scaling 
    Hohls, Frank; Zeitler, U.; Haug, Rolf J. (College Park, MD : American Physical Society, 2002)
    The temperature and electric field dependence of the conductivity in the quantum Hall effect (QHE) plateau transition for samples where no universal behavior is found in the conventional temperature dependent peak-width ...
  • Interplay of Electron and Nuclear Spin Noise in n -Type GaAs 
    Berski, Fabian; Hübner, Jens; Oestreich, Michael; Ludwig, Arne; Wieck, A.D.; Glazov, Mikhail (College Park, MD : American Physical Society, 2015)
    We present spin-noise spectroscopy measurements on an ensemble of donor-bound electrons in ultrapure GaAs:Si covering temporal dynamics over 6 orders of magnitude from milliseconds to nanoseconds. The spin-noise spectra ...
  • Kinetic and mechanistic features on the reaction of stored TiO2 electrons with Hg (II), Pb (II) and Ni (II) in aqueous suspension 
    Mohamed, Hanan H.; Alomair, Nuhad A.; Bahnemann, Detlef W. (Amsterdam : Elsevier BV, 2016)
    The reaction of electrons stored on TiO2 nanoparticles with heavy metal ions Hg (II), Ni (II) and Pb (II) has been studied employing steady state and stopped flow spectrophotometric techniques. Prior to kinetic investigation ...
  • Noise measurement of a quantized charge pump 
    Maire, Niels; Hohls, Frank; Kaestner, Bernd; Pierz, Klaus; Schumacher, Hans W.; Haug, Rolf J. (College Park, MD : American Institute of Physics, 2008)
    We study the noise properties of a gate controlled single electron pump at a driving frequency fp =400 MHz. We observe a significant reduction of the noise power on the current plateaus. This is a strong indication for ...
  • Picosecond near-to-mid-infrared absorption of pulse-injected small polarons in magnesium doped lithium niobate 
    Freytag, Felix; Booker, Philip; Corradi, Gabor; Messerschmidt, Simon; Krampf, Andreas; Imlau, Mirco (Washington, DC : Optical Society of America, 2018)
    Femtosecond-pulse-induced (Epump = 2:5 eV) picosecond infrared absorption is studied in the spectral region between 0.30 eV and 1.05 eV in LiNbO3:Mg. We find a noninstantaneous mid-infrared absorption peak in the time ...
  • Reactivity and Stability of Ultrathin VOx Films on Pt(111) in Catalytic Methanol Oxidation 
    von Boehn, Bernhard; Scholtz, Lena; Imbihl, Ronald (Dordrecht : Springer Science + Business Media, 2020)
    The growth of ultrathin layers of VOx (< 12 monolayers) on Pt(111) and the activity of these layers in catalytic methanol oxidation at 10−4 mbar have been studied with low-energy electron diffraction, Auger electron ...
  • Spin noise spectroscopy in GaAs 
    Oestreich, Michael; Römer, M.; Haug, Rolf J.; Hägele, D. (College Park, MD : American Physical Society, 2005)
    We observe the noise spectrum of electron spins in bulk GaAs by Faraday-rotation noise spectroscopy. The experimental technique enables the undisturbed measurement of the electron-spin dynamics in semiconductors. We measure ...
  • Spin noise spectroscopy in GaAs (110) quantum wells: Access to intrinsic spin lifetimes and equilibrium electron dynamics 
    Müller, Georg M.; Römer, Michael; Schuh, Dieter; Wegscheider, Werner; Hübner, Jens; Oestreich, Michael (College Park, MD : American Physical Society, 2008)
    In this Letter, the first spin noise spectroscopy measurements in semiconductor systems of reduced effective dimensionality are reported. The nondemolition measurement technique gives access to the otherwise concealed ...
  • Synchronized beamline at FLASH2 based on high-order harmonic generation for two-color dynamics studies 
    Appi, E.; Papadopoulou, C.C.; Mapa, J.L.; Jusko, C.; Mosel, P.; Schoenberg, A.; Stock, J.; Feigl, T.; Ališauskas, S.; Lang, T.; Heyl, C.M.; Manschwetus, B.; Brachmanski, M.; Braune, M.; Lindenblatt, H.; Trost, F.; Meister, S.; Schoch, P.; Trabattoni, A.; Calegari, F.; Treusch, R.; Moshammer, R.; Hartl, I.; Morgner, U.; Kovacev, M. ([Erscheinungsort nicht ermittelbar] : American Institute of Physics, 2021)
    We present the design, integration, and operation of the novel vacuum ultraviolet (VUV) beamline installed at the free-electron laser (FEL) FLASH. The VUV source is based on high-order harmonic generation (HHG) in gas and ...
  • The use of non-vacuum electron beam (NVEB) technology as an universal manufacturing process for welding and cutting of high-strength steels 
    Beniyash, A.; Klimov, G.; Hassel, T. (Bristol : Institute of Physics Publishing, 2018)
    This publication presents the advantages of NVEB technology as an universal tool for material processing based on our investigations on welding and cutting of high-strength S960QL, S1100 and S1300 steels. In this work, the ...