Regensburg 2022 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 2: Spin Phenomena in Semiconductors
HL 2.1: Hauptvortrag
Montag, 5. September 2022, 09:30–10:00, H31
Observation of quantum Zeno effects for localized spins — •Alex Greilich1, Nikita V. Leppenen2, Vitalie Nedelea1, Eiko Evers1, Dmitry S. Smirnov2, and Manfred Bayer1 — 1Experimentelle Physik 2, Technische Universität Dortmund, 44221 Dortmund, Germany — 2St. Petersburg, Russia
One of the main dephasing mechanisms for the localized carrier spins in semiconductors is the coupling to the fluctuating nuclear spin environment. Here we present an experimental observation on the effects of the quantum back action under pulsed optical measurements and demonstrate that the nuclei-induced spin relaxation can be influenced. We show that the fast measurements freeze the spin dynamics and increase the effective spin relaxation time, the so-called quantum Zeno effect. Furthermore, we demonstrate that if the measurement rate is comparable with the spin precession frequency in the effective magnetic field, the spin relaxation rate increases and becomes faster than in the absence of the measurements, an effect known as the quantum anti-Zeno effect.