SFB 767 - TP B02: Ultrafast quantumn control of single electrons and photons in mesocoic systems

Institutions
  • Department of Chemistry
  • WG Leitenstorfer (Experimentalphysik mit SP Ultrakurzzeitphysik und Quantenoptik)
  • Zukunftskolleg
Publications
    Henzler, Philipp; Traum, Christian; Holtkemper, Matthias; Nabben, David; Erbe, Marcel; Reiter, Doris E.; Kuhn, Tilmann; Mahapatra, Suddhassatta; Seletskiy, Denis V.; Leitenstorfer, Alfred (2021): Femtosecond Transfer and Manipulation of Persistent Hot-Trion Coherence in a Single CdSe/ZnSe Quantum Dot Physical Review Letters. American Physical Society (APS). 2021, 126, 067402. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.126.067402

Femtosecond Transfer and Manipulation of Persistent Hot-Trion Coherence in a Single CdSe/ZnSe Quantum Dot

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Ultrafast transmission changes around the fundamental trion resonance are studied after exciting a p-shell exciton in a negatively charged II-VI quantum dot. The biexcitonic induced absorption reveals quantum beats between hot trion states at 133 GHz. While interband dephasing is dominated by relaxation of the P-shell hole within 390 fs, trionic coherence remains stored in the spin system for 85 ps due to Pauli blocking of the triplet electron. The complex spectro-temporal evolution of transmission is explained analytically by solving the Maxwell-Liouville equations. Pump and probe polarizations provide full control over amplitude and phase of the quantum beats.

Origin (projects)

  Gumbsheimer, Pascal (2021): Struktur und Dynamik einzelner Halbleiter-Polymer-Hybridquantenpunkte

Struktur und Dynamik einzelner Halbleiter-Polymer-Hybridquantenpunkte

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Origin (projects)

    Gumbsheimer, Pascal; Conradt, Frieder; Behovits, Yannic; Huber, Steffen; Hinz, Christopher; Negele, Carla; Mecking, Stefan; Seletskiy, Denis V.; Leitenstorfer, Alfred (2021): Enhanced Determination of Emission Fine Structure and Orientation of Individual Quantum Dots Based on Correction Algorithm for Spectral Diffusion Journal of Physics D: Applied Physics. Institute of Physics Publishing (IOP). 2021, 54, 155106. ISSN 0508-3443. eISSN 1361-6463. Available under: doi: 10.1088/1361-6463/abda83

Enhanced Determination of Emission Fine Structure and Orientation of Individual Quantum Dots Based on Correction Algorithm for Spectral Diffusion

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A robust algorithm based on cross-correlations and lucky imaging reliably allows the correction of spectrally diffused datasets. This step enables the resolution-limited analysis of the emission fine structure of individual semiconductor quantum dots. Bright and dark excitonic transitions are resolved with optimum signal-to-noise ratio, allowing for a precise determination of the angular direction of linear polarization of the different lines. The angular phases between polarization directions are intrinsically connected to the orientations of emission dipoles. This fact provides a tool for accurate numerical computation of the azimuth phgr and polar angle θ of the quantum dot with respect to the optical axis. Our in-situ characterization of quantum dot fine structure and orientation represents a precise and non-invasive method without requiring specialized equipment beyond a standard luminescence setup. In this way, important information is provided whenever efficient coupling of a quantum emitter to the electro¬magnetic field is targeted by various nano- and micro-optic strategies.

Origin (projects)

  Traum, Christian (2019): Ultrakurzzeit-Spektroskopie kohärenter Elektronendynamik in einzelnen Halbleiter-Quantenpunkten

Ultrakurzzeit-Spektroskopie kohärenter Elektronendynamik in einzelnen Halbleiter-Quantenpunkten

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Origin (projects)

  Werschler, Florian (2019): Manipulation der Kopplung einzelner Elektronen an Photonen und Phononen in hybriden Festkörper-Quantenstrukturen

Manipulation der Kopplung einzelner Elektronen an Photonen und Phononen in hybriden Festkörper-Quantenstrukturen

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Origin (projects)

  Hinz, Christopher (2017): Ultraschnelle Ladungs- und Spindynamik in einzelnen Halbleiter-Quantenpunkten

Ultraschnelle Ladungs- und Spindynamik in einzelnen Halbleiter-Quantenpunkten

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Origin (projects)

Funding sources
Name Finanzierungstyp Kategorie Project no.
SFB third-party funds research funding program 522/08
Further information
Period: 01.01.2008 – 31.12.2019