SKM 2023 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 7: Poster I
HL 7.51: Poster
Monday, March 27, 2023, 13:00–15:00, P2/EG
Time-Resolved Wave-Function Mapping in Self-Assembled Quantum Qots — •Jens Kerski1, Daniel Hecker1, Nelson Creutzburg1, Arne Ludwig2, Andreas D. Wieck2, Martin Geller1, and Axel Lorke1 — 1Faculty of Physics and CENIDE, University of Duisburg-Essen, Germany — 2Chair of Applied Solid State Physics, Ruhr-University Bochum, Germany
The static and dynamic properties of self-assembled quantum dots (QDs) are often modeled using the QD’s single particle wavefunctions. Although this approximation is very successful, the influence of the electron-electron interaction on the few-particle wave-functions and their nonequilibrium dynamics has not yet been studied in detail.
We investigate an ensemble of InAs/GaAs QDs, embedded in a high electron mobility transistor. The QDs are tunnel-coupled to a two-dimensional electron gas (2DEG). By applying a voltage pulse to the gate, we induce charge carriers from the 2DEG to tunnel into targeted quantum dot states. We monitor the temporal evolution of the conductivity σ2D of the 2DEG, which is sensitive to the transfer of charge into the QDs. A rate-equation-based evaluation of σ2D allows us to separate tunneling processes into different equilibrium or non-equilibrium QD states. We use an in-plane magnetic field perpendicular to the tunneling direction for wave-function mapping [1, 2] of the quantum dot states. This allows us to study the shape and dynamics of the (excited) electron states.
[1] W. Lei et al., Phys. Rev. Lett. 105, 176804 (2010).
[2] D. Zhou et al. J. Appl. Phys. 134, 064401 (2022).