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HL: Fachverband Halbleiterphysik

HL 7: Poster I

HL 7.56: Poster

Monday, March 27, 2023, 13:00–15:00, P2/EG

The internal photoeffect from a single solid-state quantum emitter: Excitation energy and band-structure dependence — •B. Maib1, M. Zöllner1, F. Rimek1, P. Lochner1, H. Mannel1, A.D. Wieck2, A. Ludwig2, A. Lorke1, and M. Geller11University of Duisburg-Essen and CENIDE, Germany — 2Ruhr-University Bochum, Germany

The coherence time is one of the limiting factors for using single quantum emitters, like self-assembled quantum dots, in future applications of quantum information processing. Besides spin and charge noise [1] the physical limits are given by the Auger recombination [2] and an internal photoeffect [3] that is present even for resonant excitation.
We have studied in detail the photoeffect in a single self-assembled quantum dot for different energies of a non-resonant laser that excites a single electron from the bound quantum dot state into the continuum of the conduction band. These measurements are realized by time-resolved two-color resonance fluorescence (RF) excitation. The first resonant laser drives the exciton transition, while the second pulsed laser simultaneously excites the photoelectron to the final state in the conduction band, caused by the internal photoeffect.
The results can be used to reduce the internal photoeffect and therefore suppress the photoemission, which would increase the coherence time in such a single photon emitter even under resonant excitation.
[1] A. V. Kuhlmann, Nature Physics, 9, 570-575 (2013).
[2] A. Kurzmann, Nano Letters 16, 3367-3372 (2016).
[3] P. Lochner, Phys. Rev. B, 103, 075426 (2021).

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