Browsing by Subject "Semiconductor quantum dots"

Browsing by Subject "Semiconductor quantum dots"

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  • Ag, Didem; Bongartz, Rebecca; Dogan, Leyla Eral; Seleci, Muharrem; Walter, Johanna-Gabriela; Demirkol, Dilek Odaci; Stahl, Frank; Ozcelik, Serdar; Timur, Suna; Scheper, Thomas (Amsterdam : Elsevier, 2014)
    We describe here the synthesis, characterization, bioconjugation, and application of water-soluble thioglycolic acid TGA-capped CdTe/CdS quantum dots (TGA-QDs) for targeted cellular imaging. Anti-human epidermal growth ...
  • Rogge, M.C.; Fühner, C.; Keyser, U.F.; Haug, Rolf J.; Bichler, M.; Abstreiter, G.; Wegscheider, W. (College Park, MD : American Institute of Physics, 2003)
    A study was performed on combined electron-beam lithography and atomic force microscopy used for the fabrication of variable-coupling quantum dots. The conventional electron-beam lithography was combined with direct ...
  • Heine, A.W.; Tutuc, D.; Zwicknagl, G.; Haug, Rolf J. (College Park, MD : American Physical Society, 2016)
    We report on a Kondo correlated quantum dot connected to two-dimensional leads where we demonstrate the renormalization of the g factor in the pure Zeeman case. i.e., for magnetic fields parallel to the plane of the quantum ...
  • Barthold, P.; Hohls, Frank; Maire, Niels; Pierz, Klaus; Haug, Rolf J. (College Park, MD : American Physical Society, 2006)
    We have investigated the noise properties of the tunneling current through vertically coupled self-assembled InAs quantum dots. We observe super-Poissonian shot noise at low temperatures. For increased temperature this ...
  • Li, Yuan; Ding, Fei; Schmidt, Oliver G. (Bristol, UK : Institute of Physics (IOP), 2018)
    Entanglement between particles is a crucial resource in quantum information processing, an important example of which is the exploitation of entangled photons in quantum communication protocols. Among the different available ...
  • 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, 2006)
    The exciton and biexciton emissions of a series of single quantum dots of InAs in an AlAs matrix have been studied. These emissions consist of linear cross polarized doublets showing large values of both the biexciton ...
  • Fricke, Christian; Hohls, Frank; Sethubalasubramanian, Nandhavel; Fricke, Lukas; Haug, Rolf J. (College Park, MD : American Institute of Physics, 2010)
    Measurements of single electron tunneling through a quantum dot (QD) using a quantum point contact as charge detector have been performed for very long time traces with very large event counts. This large statistical basis ...
  • Höfer, B.; Zhang, J.; Wildmann, J.; Zallo, E.; Trotta, R.; Ding, Fei; Rastelli, A.; Schmidt, O.G. (College Park, ML : American Institute of Physics Inc., 2017)
    Independent tuning of emission energy and decay time of neutral excitons confined in single self-assembled In(Ga)As/GaAs quantum dots is achieved by simultaneously employing vertical electric fields and lateral biaxial ...
  • Rogge, M.C.; Räsänen, E.; Haug, Rolf J. (College Park, MD : American Physical Society, 2010)
    The electronic states of lateral many-electron quantum dots in high magnetic fields are analyzed in terms of energy and spin. In a regime with two Landau levels in the dot, several Coulomb-blockade peaks are measured. A ...
  • Sarkar, D.; Van Der Meulen, H.P.; Calleja, J.M.; Meyer, J.M.; Haug, Rolf J.; Pierz, K. (Bristol : IOP Publishing Ltd., 2010)
    We present non-resonant, polarization-resolved magneto-photoluminescence measurements up to 12 T on single InAs/AlAs quantum dots. We observe typical g-factors between 1 and 2, very low diamagnetic shifts due to strong ...
  • Rogge, M.C.; Fühner, C.; Haug, Rolf J. (College Park, MD : American Physical Society, 2006)
    Single electron tunneling is studied in a many electron quantum dot in high magnetic fields. For such a system multiple transitions of the spin configuration are theoretically predicted. With a combination of spin blockade ...
  • Kießlich, G.; Schöll, E.; Brandes, T.; Hohls, Frank; Haug, Rolf J. (College Park, MD : American Physical Society, 2007)
    We show that the intriguing observation of noise enhancement in the charge transport through two vertically coupled quantum dots can be explained by the interplay of quantum coherence and strong Coulomb blockade. We ...
  • Dahbashi, Ramin; Hübner, Jens; Berski, Fabian; Pierz, Klaus; Oestreich, Michael (College Park, MD : American Physical Society, 2014)
    We advance spin noise spectroscopy to the ultimate limit of single spin detection. This technique enables the measurement of the spin dynamic of a single heavy hole localized in a flat (InGa)As quantum dot. Magnetic field ...
  • Akin, M.; Bongartz, Rebecca; Walter, J.G.; Demirkol, D.O.; Stahl, F.; Timur, S.; Scheper, Thomas (Cambridge : Royal Society of Chemistry, 2012)
    Herein, the phase-transfer reaction of quantum dots (QDs) with amine-terminated polyamidoamine (PAMAM) dendrimers with controllable ligand molar ratios was achieved. The unique properties of PAMAM allowed us to build up ...
  • Kupidura, D.; Rogge, M.C.; Reinwald, M.; Wegscheider, W.; Haug, Rolf J. (College Park, MD : American Physical Society, 2006)
    We investigate the Kondo effect and spin blockade observed in a many-electron quantum dot and study the magnetic field dependence. At lower fields, a pronounced Kondo effect is found, which is replaced by the spin blockade ...
  • Agafonov, Oleksiy B.; Dais, Christian; Grützmacher, Detlev; Haug, Rolf J. (College Park, MD : American Institute of Physics, 2010)
    Magnetotunneling spectroscopy was employed to probe the confinement in vertical Si/Ge double-barrier resonant tunneling diodes with regularly distributed Ge quantum dots. Their current-voltage characteristics reveal a ...
  • Rogge, M.C.; Pierz, Klaus; Haug, Rolf J. (College Park, MD : American Institute of Physics, 2013)
    We present a lateral quantum dot device which has a tunable number of quantum dots. Depending on easily tunable gate voltages, one, two or three quantum dots are found. They are investigated in transport and charge detection. ...
  • Mühle, A.; Wegscheider, W.; Haug, Rolf J. (College Park, MD : American Institute of Physics, 2008)
    We demonstrate the tunability of a GaAsAlGaAs quantum ring showing coherent Aharonov-Bohm oscillations up to a gate voltage regime where the ring splits into three quantum dots. This is explained based on the structure's ...
  • Sarkar, D.; Van Der Meulen, H.P.; Calleja, J.M.; Meyer, J.M.; Haug, Rolf J.; Pierz, Klaus (College Park, MD : American Institute of Physics, 2008)
    Excitations of a single InAsAlAs self-assembled quantum dot were investigated by photoluminescence excitation spectroscopy. Resonant absorption by longitudinal-optical (LO) phonons of the quantum dot and the barriers is ...
  • Heine, A.W.; Tutuc, D.; Zwicknagl, G.; Schuh, D.; Wegscheider, W.; Haug, Rolf J. (College Park, MD : American Institute of Physics, 2013)
    The competition between the Kondo effect and the Ruderman-Kittel-Kasuya- Yoshida (RKKY) interaction is investigated in a double quantum dots system, coupled via a central open conducting region. A perpendicular magnetic ...