Berlin 2015 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 39: Posters II (Topological insulators; Graphene; Spintronics and spin physics; Quantum information science)
HL 39.30: Poster
Dienstag, 17. März 2015, 14:00–20:00, Poster F
Spin Noise Spectroscopy on single InAs Quantum Dots — •Julia Wiegand1, Ramin Dahbashi1, Jens Hübner1, Klaus Pierz2, Arne Ludwig3, Andreas Wieck3, and Michael Oestreich1 — 1Leibniz Universität Hannover, Institut für Festkörperphysik, Abteilung Nanostrukturen, Appelstraße 2, D-30167 Hannover, Germany — 2Physikalisch Technische Bundesanstalt, Bundesallee 100, D-38116 Braunschweig, Germany — 3Ruhr-Universität Bochum, Angewandte Festkörperphysik, Universitätsstraße 150, D-44801 Bochum, Germany
The spin dynamics of electrons and holes confined in InAs quantum dots (QDs) are of particular interest for future applications in solid state quantum information processing. We employ spin noise spectroscopy (SNS) to access the intrinsic spin dynamics of confined carriers in individual QDs [1]. Measurements of single heavy hole spin dynamics reveal very long spin lifetimes up to 180 µ s and a strong dependence of the longitudinal heavy hole spin relexation time for low magnetic fields [2]. The observed parasitic influence of charge fluctuations in the QD vicinity can be reduced by embedding the QDs in a Schottky diode structure. This also yields the advantages of deterministic charge control and tuning of the QD resonance via the quantum confined Stark effect.
[1] J. Hübner, F. Berski, R. Dahbashi, and M. Oestreich, physica status solidi (b) 251, 1824 (2014).
[2] R. Dahbashi, J. Hübner, F. Berski, K. Pierz, and M. Oestreich, Phys. Rev. Lett. 112, 156601 (2014).