Auflistung nach Schlagwort "electron"

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  • Angular dependence of the Wigner time delay upon tunnel ionization of H2 
    Trabert, D.; Brennecke, S.; Fehre, K.; Anders, N.; Geyer, A.; Grundmann, S.; Schöffler, M. S.; Schmidt, L. Ph. H.; Jahnke, T.; Dörner, R.; Kunitski, M.; Eckart, S. ([London] : Nature Publishing Group UK, 2021)
    When a very strong light field is applied to a molecule an electron can be ejected by tunneling. In order to quantify the time-resolved dynamics of this ionization process, the concept of the Wigner time delay can be used. ...
  • Comparison between the compressibilities of the zero field and composite-fermion metallic states of the two-dimensional electron system 
    Dorozhkin, S.I.; Smet, J.H.; von Klitzing, K.; Umansky, V.; Haug, Rolf J.; Ploog, K. (College Park, MD : American Physical Society, 2001)
    We have studied the capacitance between a two-dimensional electron system and a gate of field-effect transistors, produced from three different wafers with a single remotely doped GaAs/AlxGa1-xAs heterojunction. In the ...
  • Electron flux is a key determinant of uranium isotope fractionation during bacterial reduction 
    Brown, Ashley R.; Molinas, Margaux; Roebbert, Yvonne; Sato, Ataru; Abe, Minori; Weyer, Stefan; Bernier-Latmani, Rizlan (London : Springer Nature, 2023)
    Uranium isotopic signatures in the rock record are utilized as a proxy for past redox conditions on Earth. However, these signatures display significant variability that complicates the interpretation of specific redox ...
  • 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 ...
  • Flux-quantum-modulated Kondo conductance in a multielectron quantum dot 
    Fühner, C.; Keyser, U.F.; Haug, Rolf J.; Reuter, D.; Wieck, A.D. (College Park, MD : American Physical Society, 2002)
    We investigate a lateral semiconductor quantum dot with a large number of electrons in the limit of strong coupling to the leads. A Kondo effect is observed and can be tuned in a perpendicular magnetic field. This Kondo ...
  • Impurity effects in quantum dots: Toward quantitative modeling 
    Räsänen, E.; Könemann, J.; Haug, Rolf J.; Puska, M.J.; Nieminen, R.M. (College Park, MD : American Physical Society, 2004)
    We have studied the single-electron transport spectrum of a quantum dot in GaAs/AlGaAs resonant tunneling device. The measured spectrum has irregularities indicating a broken circular symmetry. We model the system with an ...
  • Kinetics of N2O production and reduction in a nitrate-contaminated aquifer inferred from laboratory incubation experiments 
    Weymann, D.; Geistlinger, H.; Well, R.; Heide, Carolin von der; Flessa, H. (Göttingen : Copernicus GmbH, 2010)
    Knowledge of the kinetics of N2O production and reduction in groundwater is essential for the assessment of potential indirect emissions of the greenhouse gas. In the present study, we investigated this kinetics using a ...
  • Magnetic-field-induced singularities in spin-dependent tunneling through InAs quantum dots 
    Hapke-Wurst, I.; Zeitler, U.; Frahm, Holger; Jansen, A.G.M.; Haug, Rolf J.; Pierz, Klaus (College Park, MD : American Physical Society, 2000)
    Current steps attributed to resonant tunneling through individual InAs quantum dots embedded in a GaAs-AlAs-GaAs tunneling device are investigated experimentally in magnetic fields up to 28 T. The steps evolve into strongly ...
  • Photo-excited charge transfer from adamantane to electronic bound states in water 
    Wang, Xiangfei; Krause, Pascal; Kirschbaum, Thorren; Palczynski, Karol; Dzubiella, Joachim; Bande, Annika (Cambridge : RSC Publ., 2024)
    Aqueous nanodiamonds illuminated by UV light produce free solvated electrons, which may drive high-energy reduction reactions in water. However, the influence of water conformations on the excited-state electron-transfer ...
  • Quantitative three-dimensional local order analysis of nanomaterials through electron diffraction 
    Schmidt, Ella Mara; Klar, Paul Benjamin; Krysiak, Yaşar; Svora, Petr; Goodwin, Andrew L.; Palatinus, Lukas ([London] : Nature Publishing Group UK, 2023)
    Structure-property relationships in ordered materials have long been a core principle in materials design. However, the introduction of disorder into materials provides structural flexibility and thus access to material ...
  • Shot noise in self-assembled InAS quantum dots 
    Nauen, A.; Hapke-Wurst, I.; Hohls, Frank; Zeitler, U.; Haug, Rolf J.; Pierz, Klaus (College Park, MD : American Physical Society, 2002)
    We investigate the noise properties of a GaAs-AlAs-GaAs tunneling structure with embedded self-assembled InAs quantum dots in the single-electron tunneling regime. We analyze the dependence of the relative noise amplitude ...