Dresden 2020 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 64: Poster II

HL 64.44: Poster

Thursday, March 19, 2020, 10:00–13:00, P1A

Spin Noise Spectroscopy Setup for single GaAs Quantum Dots resonant at the Rb D-line — •Tianjiao Sun, An Zhao, Xin Cao, Fei Ding, Jens Hübner, and Michael Oestreich — Institute for Solid State Physics,Appelstraße 2, D-30167 Hannover, Germany

Electrons and holes confined in single quantum dots (QDs) have attracted much attention since they are potential candidates for semiconductor quantum information qubits. We use spin noise spectroscopy, to access the spin dynamics of confined carriers in single quantum dots, as well as the interaction of single confined carriers with the nuclear environment[1]. In addition, a recent report shows for (InGa)As QDs an occupation noise contribution in resonant spin noise measurements which reveals the dynamics of charge exchange between the QD and its environment due to Auger recombination[2]. Here, we aim for the investigation of the intrinsic spin and charge dynamics in a new type of symmetric GaAs QDs[3]. The low strain in these QDs can enable a prolonged spin coherence time compared to (InGa)As QDs. Furthermore, the optical transition at the Rb D-line is promising for a potential realization of coherent coupling of solid-state and atomic qubit implementations.

[1] J. Hübner, F. Berski, R. Dahbashi, and M. Oestreich, physica status solidi (b) 251, 1824 (2014).

[2] J. Wiegand, D. S. Smirnov, J. Osberghaus, L. Abaspour, J. Hübner, and M. Oestreich, Phys. Rev. B 98, 125426(2018).

[3] R. Keil, M. Zopf, Y. Chen, B. Höfer, J. Zhang, F. Ding, and O. G. Schmidt, Nat. Commun. 8, 15501 (2017).