Auflistung nach Schlagwort "Nanocrystals"

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  • Absorption and multi-phonon quenching in nanocrystal doped SiO2 fibers 
    Steinke, Michael; Spelthann, Simon; Rühl, Axel; Ristau, Detlev (Washington, DC : Optica, 2021)
    SiO2 fibers doped with rare-earth-doped nanocrystals are promising to overcome the strong SiO2 multi-phonon quenching and could yield novel laser gain materials. So far, no attention has been paid to the question how well ...
  • Colloidal Cu 2-x(S ySe 1-y) alloy nanocrystals with controllable crystal phase: Synthesis, plasmonic properties, cation exchange and electrochemical lithiation 
    Dilena, Enrico; Dorfs, Dirk; George, Chandramohan; Miszta, Karol; Povia, Mauro; Genovese, Alessandro; Casu, Alberto; Prato, Mirko; Manna, Liberato (Cambridge : Royal Society of Chemistry, 2012)
    We report synthetic routes to both cubic and hexagonal phase Cu 2-x(S ySe 1-y) alloy nanocrystals exhibiting a well-defined near-infrared valence band plasmon resonance, the spectral position of which is dependent mainly ...
  • Competition between Kondo Screening and Quantum Hall Edge Reconstruction 
    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 ...
  • High efficiency grating couplers for strain tunable GaAs quantum dot based entangled photon sources 
    Schmidt, Constantin; Ma, Chenxi; Benthin, Frederik; Yang, Jingzhong; Rugeramigabo, Eddy P.; Zopf, Michael; Ding, Fei (New York, NY : American Inst. of Physics, 2024)
    The on-chip integration of single photon and entangled photon emitters such as epitaxially grown semiconductor quantum dots into photonic frameworks is a rapidly evolving research field. GaAs quantum dots offer high purity ...
  • Independent tuning of excitonic emission energy and decay time in single semiconductor quantum dots 
    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 ...
  • Single photon emission from ODT passivated near-surface GaAs quantum dots 
    Cao, Xin; Yang, Jingzhong; Li, Pengji; Zhang, Yiteng; Rugeramigabo, Eddy P.; Brechtken, Benedikt; Haug, Rolf J.; Zopf, Michael; Ding, Fei (Melville, NY : American Inst. of Physics, 2021)
    Epitaxially grown semiconductor quantum dots are promising candidates for pure single photon and polarization-entangled photon pair emission. Excellent optical properties can typically be ensured only if these so-called ...
  • The size-selective interaction of key and lock nanocrystals driven by depletion attraction at the nanoscale 
    Hinrichs, D.; Himstedt, R.; Dorfs, Dirk (Cambridge : Royal Society of Chemistry, 2018)
    In this article, we study the size-dependent interactions of quasi-spherical nanocrystals with voids of concave nanoparticles of complementary sizes and shapes. Experimental insights into a system with key and lock particles ...
  • Spectroscopy and excitation dynamicis of LiYF4:Pr3+ nanocrystals 
    Spelthann, Simon (Hannover : Institutionelles Repositorium der Gottfried Wilhelm Leibniz Unviersität Hannover, 2023)
    Downsizing lanthanide-doped crystals to the nanoscale allows for new applications in a variety of forms as photonic composites. The dipole-forbidden 4f transitions in trivalent lanthanide ions promise high excited state ...
  • Temperature-dependent broadening of coherent current peaks in InAs double quantum dots 
    Dani, Olfa; Hussein, Robert; Bayer, Johannes C.; Kohler, Sigmund; Haug, Rolf J. (London : Springer Nature, 2022)
    Quantum systems as used for quantum computation or quantum sensing are nowadays often realized in solid state devices as e.g. complex Josephson circuits or coupled quantum-dot systems. Condensed matter as an environment ...
  • Upconversion nanocrystal doped polymer fiber thermometer 
    Thiem, Jonas; Spelthann, Simon; Neumann, Laurie; Jakobs, Florian; Johannes, Hans-Hermann; Kowalsky, Wolfgang; Kracht, Dietmar; Neumann, Joerg; Ruehl, Axel; Ristau, Detlev (Basel : MDPI AG, 2020)
    In recent years, lanthanide-doped nanothermometers have been mainly used in thin films or dispersed in organic solvents. However, both approaches have disadvantages such as the short interaction lengths of the active ...