Freiburg 2019 – wissenschaftliches Programm

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FM: Fall Meeting

FM 38: Enabling Technologies: Quantum Dots, Quantum Wires, Point Contacts and Excitonic Systems

FM 38.6: Talk

Dienstag, 24. September 2019, 15:15–15:30, 3043

Charge Reconfiguration in Isolated Quantum Dot Arrays — •Johannes C. Bayer, Timo Wagner, Eddy P. Rugeramigabo, and Rolf J. Haug — Institut für Festkörperphysik, Leibniz Universität Hannover, Hanover, Germany

The quantum dot device is based on a GaAs/ALGaAs heterostructure. Up to four lateral quantum dots in series are defined by potentials applied to metallic Schottky gates. Two quantum point contacts in the vicinity are used as charge detectors, allowing real-time detection of electrons tunneling through the array [1, 2].

In the isolated regime, charge detectors are utilized to observe charges tunneling inside the quantum dot array. Our highly tunable device allowed the investigation of isolated double, triple and quadruple quantum dot configurations. Experimental results are complemented by simulations, which enable the identification of the different transitions occurring in these systems. Tunable higher order tunneling transitions between non-neighboring quantum dots are observed for triple and quadruple quantum dot arrays [3, 4].

[1] T. Wagner, et. al., Nat. Nanotechnol. 12, 218-222 (2017).
[2] T. Wagner, et. al., Nat. Phys. 15, 330-334 (2019).
[3] J. C. Bayer, et. al., Phys. Rev. B 96, 235305 (2017).
[4] J. C. Bayer, et. al., Ann, Phys (Berlin), 531, 1800393 (2019).

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