Browsing by Subject "quantum dots"

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  • Könemann, J.; Fal'ko, V.I.; Maude, D.K.; Haug, Rolf J. (College Park, MD : American Institute of Physics, 2005)
    By single-electron tunneling spectroscopy we investigate the difference in spin splitting of single-electron resonances in a double-barrier structure subjected to a magnetic field perpendicular (Δ⊥) and parallel (Δ∥) to ...
  • Fricke, Christian; Hohls, Frank; Wegscheider, W.; Haug, Rolf J. (College Park, MD : American Physical Society, 2007)
    We explore the full counting statistics of single-electron tunneling through a quantum dot using a quantum point contact as noninvasive high bandwidth charge detector. The distribution of counted tunneling events is measured ...
  • Rogge, M.C.; Harke, B.; Fricke, Christian; Hohls, Frank; Reinwald, M.; Wegscheider, W.; Haug, Rolf J. (College Park, MD : American Physical Society, 2005)
    With noninvasive methods, we investigate ground and excited states of a lateral quantum dot. Charge detection via a quantum point contact is used to map the dot dynamics in a regime where the current through the dot is too ...
  • Frahm, Holger; von Zobeltitz, Carsten; Maire, Niels; Haug, Rolf J. (College Park, MD : American Physical Society, 2006)
    We study the Fermi-edge singularity appearing in the current-voltage characteristics for resonant tunneling through a localized level at finite temperature. An explicit expression for the current at low temperature and ...
  • Könemann, J.; Räsänen, E.; Puska, M.J.; Nieminen, R.M.; Haug, Rolf J. (College Park, MD : American Institute of Physics, 2005)
    We have studied the single-electron transport spectrum of a localized level embedded into a double-barrier resonant tunneling structure. The experimental spectrum shows clear deviations from the Fock-Darwin model indicating ...
  • Maire, Niels; Hohls, Frank; Lüdtke, T.; Pierz, Klaus; Haug, Rolf J. (College Park, MD : American Physical Society, 2007)
    We present noise measurements of self-assembled InAs quantum dots at high magnetic field. In comparison to I-V characteristics at zero magnetic field, we notice a strong current overshoot that is due to a Fermi-edge ...
  • Fricke, Christian; Rogge, M.C.; Harke, B.; Reinwald, M.; Wegscheider, W.; Hohls, Frank; Haug, Rolf J. (College Park, MD : American Physical Society, 2005)
    We demonstrate electron redistribution caused by magnetic field on a single quantum dot measured by means of a quantum point contact as noninvasive detector. Our device, which is fabricated by local anodic oxidation, allows ...
  • Rogge, M.C.; Haug, Rolf J. (College Park, MD : American Physical Society, 2008)
    We performed charge detection on a lateral triple quantum dot with starlike geometry. The setup allows us to interpret the results in terms of two double dots with one common dot. One double dot features weak tunnel coupling ...
  • Reck, Michael (Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2009)
    [no abstract]
  • Sarkar, D.; Van Der Meulen, H.P.; Calleja, J.M.; Meyer, J.M.; Haug, Rolf J.; Pierz, Klaus (College Park, MD : American Physical Society, 2008)
    Microphotoluminescence spectroscopy at variable temperature, excitation intensity, and energy was performed on a single InAs/AlAs self-assembled quantum dot. The exciton emission line [zero-phonon line (ZPL)] exhibits a ...
  • Sarkar, D.; Van Der Meulen, H.P.; Calleja, J.M.; Becker, J.M.; Haug, Rolf J.; Pierz, Klaus (College Park, MD : American Institute of Physics, 2005)
    Optical transitions in self-assembled InAs/AlAs quantum dots were investigated by photoluminescence and photoluminescence excitation spectroscopy. In photoluminescence we found below about 1.8 eV emission from quantum dots ...
  • Hohls, Frank; Nauen, André; Maire, Niels; Pierz, Klaus; Haug, Rolf J. (College Park, MD : American Institute of Physics, 2005)
    We examine the dynamical properties of resonant tunneling through single InAs quantum dots by measuring the shot noise of the current. We observe an approximately linear voltage dependence of both the shot noise, characterized ...
  • Schmidt, T.; Haug, Rolf J.; v. Klitzing, K.; Förster, A.; Lüth, H. (College Park, MD : American Physical Society, 1997)
    We investigate low-temperature transport through two identical vertically coupled quantum dots in a triple-barrier heterostructure. The current-voltage curve exhibits two series of current steps of different magnitude. On ...
  • Dahbashi, Ramin (Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2015)
    [no abstract]
  • Aguirre, Matias E.; Perelstein, Gonzalo; Feldhoff, Armin; Condo, Adriana; Tolley, Alfredo J.; Grela, Maria A. (Cambridge : Royal Society of Chemistry, 2015)
    The room temperature spontaneous reduction of HAuCl4 in ethylene glycol in the presence of pre-formed ZnO nanoparticles is investigated by UV-vis spectroscopy. Analysis by HRTEM demonstrated that the synthesized nanostructures ...
  • Tutuc, D.; Popescu, B.; Schuh, D.; Wegscheider, W.; Haug, Rolf J. (College Park, MD : American Physical Society, 2011)
    We study the tuning mechanisms of Ruderman-Kittel-Kasuya-Yosida (RKKY) exchange interaction between two lateral quantum dots in the Kondo regime. At zero magnetic field we observe the expected splitting of the Kondo resonance ...
  • Könemann, Jens; Kubala, Björn; König, Jürgen; Haug, Rolf J. (College Park, MD : American Physical Society, 2006)
    Single-electron tunneling through a zero-dimensional state in an asymmetric double-barrier resonant-tunneling structure is studied. The broadening of steps in the I-V characteristics is found to strongly depend on the ...