Auflistung nach Schlagwort "quantum dots"

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  • Anisotropy of Zeeman-splitting in quantum dots 
    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 ...
  • Aqueous synthesis and characterization of CdTe/CdS/ZnS quantum dots, their cytotoxicity, and cellular interactions 
    Ulusoy, Mehriban (Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2016)
    [no abstract]
  • Bimodal counting statistics in single-electron tunneling through a quantum dot 
    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 ...
  • Coupling symmetry of quantum dot states 
    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 ...
  • Fermi-edge singularities in transport through quantum dots 
    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 ...
  • Fluorescence Masking Based Multifunctional Quantum Dots’ Assay for HSP90α Interactions Detection 
    Kishore, Anusha; Fan, Lu; Stahl, Frank; Reichel, Thomas; Krüger, Karsten; Zeilinger, Carsten (Basel : MDPI, 2023)
    HSP90α is one of the most common stress proteins in cells; hence, it is a good target for developing drugs and testing systems for cancer or physical stress levels in humans. Streptavidin conjugated quantum dots (Sav-QDs) ...
  • Level anticrossings in quantum dots 
    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 ...
  • Noise at a Fermi-edge singularity in self-assembled InAs quantum dots 
    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 ...
  • Noninvasive detection of charge rearrangement in a quantum dot in high magnetic fields 
    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 ...
  • Noninvasive detection of molecular bonds in quantum dots 
    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 ...
  • Optimierung der Sekretion von rekombinanten Proteinen aus Escherichia coli durch Analyse der Genexpression 
    Reck, Michael (Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2009)
    [no abstract]
  • Piezoelectric exciton acoustic-phonon coupling in single quantum dots 
    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 ...
  • Polaronic effects in optical transitions of single InAs/AlAs quantum dots 
    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 ...
  • Shot noise in tunneling through a single InAs quantum dot 
    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 ...
  • Spectroscopy of the single-particle states of a quantum-dot molecule 
    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 ...
  • Spinrauschen in nulldimensionalen Strukturen 
    Dahbashi, Ramin (Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2015)
    [no abstract]
  • The spontaneous room temperature reduction of HAuCl4 in ethylene glycol in the presence of ZnO: a simple strategy to obtain stable Au/ZnO nanostructures exhibiting strong surface plasmon resonance and efficient electron storage properties 
    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 ...
  • Supramolecular Click Chemistry for Surface Modification of Quantum Dots Mediated by Cucurbit[7]uril 
    McGuire, Katie; He, Suhang; Gracie, Jennifer; Bryson, Charlotte; Zheng, Dazhong; Clark, Alasdair W.; Koehnke, Jesko; France, David J.; Nau, Werner M.; Lee, Tung-Chun; Peveler, William J. (Washington, DC : Soc., 2023)
    Cucurbiturils (CBs), barrel-shaped macrocyclic molecules, are capable of self-assembling at the surface of nanomaterials in their native state, via their carbonyl-ringed portals. However, the symmetrical two-portal structure ...
  • Tunable nonlocal coupling between Kondo impurities 
    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 ...
  • Tunneling resonances in quantum dots: Coulomb interaction modifies the width 
    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 ...