SKM 2023 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 33: Poster II
HL 33.33: Poster
Wednesday, March 29, 2023, 17:00–19:00, P1
On-demand strain-induced recombination dynamics in semiconductor quantum wells — Daniel Hensel1, Daniel Schmidt3, Fariba Hatami2, and •Peter Gaal1,3 — 1Leibniz-Institut für Kristallzüchtung, 12489 Berlin — 2Humboldt Universität zu Berlin, 12489 Berlin — 3TXproducts UG, 22547 Hamburg
Todays technology enables the fabrication of semiconductor structures with a high control over the electronic states. New technologies emerged from the manipulation of these states. To gain full control over the quantum state encrypted in a particle one must control both its lifetime and its coherence. Tailored transient strain pulses provide a new tool for the manipulation of nanoscale quantum objects. The strain-induced deformation of the crystal lattice manipulates the electronic bandstructure via deformation potential coupling. A convenient method to administer strain pulses to a sample are so-called surface acoustic waves (SAW). They are generated electronically by interdigitated circuits (IDT). The experimental control is limited by the ability to generate arbitrary lattice deformations on timescales short compared to the quantum decoherence. The photoacoustic method allows controlling the spatial and temporal shape of the optical excitation and thus shapes the strain pulse. In consequence, arbitrary SAWs can be generated on ultrafast timescales. Time-resolved photoluminescence (TRPL) spectroscopy is used to monitor the strain-induced change in electronic bandstructure. The control of the efficiency of radiative transitions of excitons through the applied strain could be the missing step for the realization of a fast on-demand single photon source.