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Freiburg 2019 – wissenschaftliches Programm

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FM: Fall Meeting

FM 63: Poster: Enabling Technologies: Quantum Materials, Quantum Dots, Quantum Wires, Point Contacts and Superconducting Systems

FM 63.3: Poster

Mittwoch, 25. September 2019, 16:30–18:30, Tents

Extended nuclear spin coherence in an ensemble of (In,Ga)As/GaAs quantum dots — •Eiko Evers1, Tomasz Kazimierczuk1,2, Alex Greilich1, Dmitri R. Yakovlev1,3, Andreas D. Wieck4, Dirk Reuter5, and Manfred Bayer1,31Experimentelle Physik 2, TU Dortmund University, 44221 Dortmund, GermanyExperimentelle Physik 2, TU Dortmund Univrsity — 2Institute of Experimental Physics, Faculty of Physics, University of Warsaw, 02-093 Warsaw, Poland — 3Ioffe Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia — 4Optoelectronic Materials and Devices, Paderborn University, 33098 Paderborn, Germany — 5Angewandte Festkörperphysik, Ruhr-Universität Bochum, 44780 Bochum, Germany

Singly-charged (In,Ga)As/GaAs quantum dots (QDs) offer a playground to study the dynamics of the electron-spin (e-spin) confined within a nuclear spin bath. In a magnetic field perpendicular to the growth axis, the µs-long e-spin transverse coherence time allows preferential pumping of e-spins with a precession frequency resonant to the pumping periodicity. The periodical pumping moreover leads to a nuclear bath polarization (Overhauser field) that drives a single e-spin’s precession frequency into resonance with the pumping frequency, the so called nuclei-induced frequency focusing (NIFF). While it has been reported that the nuclear spin coherence time for singly-charged QDs is in the µs range, we find that the synchroization of the nuclear-electron spin system also leads to a ms-long nuclear spin coherence time.

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