Berlin 2018 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 24: Poster Session II
HL 24.14: Poster
Tuesday, March 13, 2018, 18:30–20:30, Poster F
Optical detection of Coulomb interaction in self-assembled quantum dots — •Jens Kerski1, Pia Eickelmann1, Arne Ludwig2, Andreas D. Wieck2, Annika Kurzmann1, Axel Lorke1, and Martin Geller1 — 1Faculty of Physics and CENIDE, University Duisburg-Essen, Germany — 2Chair of Applied Solid State Physics, Ruhr-University Bochum, Germany
Self-assembled quantum dots (QDs) can be used in an optical detection scheme to probe their electrical and spin environment on the nanoscale [1, 2]. In resonance fluorescence, such a nano-electrometer could be also used to investigate transport phenomena, like single electron tunneling into a single quantum dot [3].
In this work, we combine the optical detection with transport measurements by using two quantum dots that are coupled by Coulomb interaction. We perform resonant time-resolved optical measurements on a single InAs QD, which acts as a nanoscale electrometer for detection of tunneling events into a second, nearby dot. The latter is charged by applying a gate voltage. Once an electron is captured in the second QD, its electric field changes the exciton transition energy by the quantum-confined Stark effect of the first dot, which can be observed in a time-resolved measurement.
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J. Houel et al., Phys. Rev. Lett. 108, 107401 (2012).
A. Kurzmann et al., Phys. Rev. Lett. 117, 017401 (2016).