Auflistung nach Schlagwort "energy"

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  • Correlation-function spectroscopy of inelastic lifetime in heavily doped GaAs heterostructures 
    Könemann, J.; König, P.; Schmidt, T.; McCann, E.; Fal’ko, V.I.; Haug, Rolf J. (College Park, MD : American Physical Society, 2001)
    Measurements of resonant tunneling through a localized impurity state are used to probe fluctuations in the local density of states of heavily doped GaAs. The measured differential conductance is analyzed in terms of ...
  • Depinning transitions between adsorbate chains coupled by Friedel oscillations 
    Godzik, G.; Block, T.; Pfnür, Herbert (College Park, MD : American Physical Society, 2003)
    The low coverage phase transitions of the p(8×1) and the p(5×1) chain structures of the Sr/Mo(112) system have been investigated with low-energy electron diffraction (LEED) at constant coverages. It turns out that both ...
  • Energy conservation in urban areas in the framework of a sustainable transportation concept 
    Shahin, Mohamed Maher (Hannover : Universität, 2001)
    [no abstract]
  • Experimental simulation and limitations of quantum walks with trapped ions 
    Matjeschk, R.; Schneider, C; Enderlein, M.; Huber, T.; Schmitz, H.; Glueckert, J.; Schaetz, T. (Bristol : IOP Publishing Ltd., 2012)
    We examine the prospects of discrete quantum walks (QWs) with trapped ions. In particular, we analyze in detail the limitations of the protocol of Travaglione and Milburn (2002 Phys. Rev. A 65 032310) that has been implemented ...
  • 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 ...
  • Formation of surface color centers at differently coordinated sites: MgO/Ag(1,1,19) 
    Kramer, J.; Tegenkamp, Christoph; Pfnür, Herbert (College Park, MD : American Physical Society, 2003)
    In order to find criteria for discrimination between surface color centers at terraces and steps, and bulk color centers, the characteristic losses of these centers have been investigated by electron energy loss spectroscopy ...
  • 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 ...
  • 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 ...
  • Modelling of thermal radiation exchange at glass-covered greenhouse surfaces under different climatic conditions 
    Ronoh, Erick Kiplangat (Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2016)
    [no abstract]
  • Phonons in InAs/AlAs single quantum dots observed by optical emission 
    Sarkar, D.; Van Der Meulen, H.P.; Calleja, J.M.; Becker, J.M.; Haug, Rolf J.; Pierz, Klaus (College Park, MD : American Physical Society, 2005)
    Photoluminescence emission spectra of self-assembled single InAs/AlAs quantum dots with variable size reveal typical sharp lines below 1.8 eV, corresponding to transitions between fully confined states. Above this energy ...
  • Properties of quasilocal mass in binary black hole mergers 
    Pook-Kolb, Daniel; Zhao, Bowen; Andersson, Lars; Krishnan, Badri; Yau, Shing-Tung (Ridge, NY : American Physical Society, 2023)
    Identifying a general quasilocal notion of energy-momentum and angular momentum would be an important advance in general relativity with potentially important consequences for mathematical and astrophysical studies in ...
  • Restructuring of the Ge(100) surface by Na chains 
    Ernst, Wolfgang; Jonas, K.-L.; von Oeynhausen, V.; Tegenkamp, Christoph; Pfnür, Herbert (College Park, MD : American Physical Society, 2003)
    The Na-induced surface structures on Ge(100) at concentrations below 0.1 monolayer (ML) have been investigated with low-energy electron diffraction and with scanning tunneling microscopy (STM). Annealing and partial ...
  • 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 ...
  • Step and kink correlations on vicinal Ge(100) surfaces investigated by electron diffraction 
    Tegenkamp, Christoph; Wollschläger, Joachim; Pfnür, Herbert; Meyer zu Heringdorf, Frank-J.; Horn-von Hoegen, Michael (College Park, MD : American Physical Society, 2002)
    Using spot profile analysis in low-energy electron diffraction, we have investigated vicinal Ge(100) surfaces, which were miscut by 2.7° and 5.4°, respectively, in [011] direction with respect to the surface normal. Within ...
  • Universal properties of anisotropic dipolar bosons in two dimensions 
    Sánchez-Baena, Juan; Peña Ardila, Luisllu; Astrakharchik, Gregory; Mazzanti, Ferran (Amsterdam : SciPost Foundation, 2022)
    The energy of ultra-dilute quantum many-body systems is known to exhibit a universal dependence on the gas parameter x = nad0, with n the density, d the dimensionality of the space (d = 1,2,3) and a0 the s-wave scattering ...