SKM 2023 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 35: Focus Session: Transient multi-wave mixing on excitonic resonances

HL 35.3: Hauptvortrag

Donnerstag, 30. März 2023, 10:30–11:00, POT 251

Hot-Exciton Quantum Dynamics in Zero-Dimensional Structures — •Alfred Leitenstorfer — Department of Physics and Center for Applied Photonics, University of Konstanz, Germany

Electronic quantum processes in intrinsic dimensions of time and space are investigated with femtosecond transient transmission spectroscopy of individual II-VI quantum dots. With our experiments, we are aiming at single-photon amplification for the ultimate control of the quantum statistics of ultrashort light pulses [1]. In these systems, the elementary dynamics of charges and spins is dominated by fundamental aspects such as Coulomb correlations and the Pauli principle [2]. Harnessing a pump-probe microscope optimized for single-electron sensitivity at cryogenic temperatures and high magnetic fields [3], we find extremely asymmetric relaxation characteristics in valence and conduction bands where e.g. femtosecond quantum kinetics of hole-phonon coupling is compatible with persistent spin coherence of hot excitons [4].

[1] F. Sotier et al., Nature Phys. 5, 352 (2009)

[2] C. Hinz et al., Phys. Rev. B97, 045302 (2018)

[3] C. Traum et al., Rev. Sci. Instr. 90, 123003 (2019)

[4] P. Henzler et al., Phys. Rev. Lett. 126, 067402 (2021)