Regensburg 2016 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 4: Spintronics: Nanostructures and Optics
HL 4.7: Vortrag
Montag, 7. März 2016, 11:30–11:45, H13
Low Field Nuclear Magnetic Resonance in Gallium Arsenide detected via Spin Noise Spectroscopy — •Fabian Berski1, Jens Hübner1, Michael Oestreich1, Arne Ludwig2, A. D. Wieck2, and Mikhail Glazov3 — 1Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstr. 2, D-30167 Hannover, Germany — 2Angewandte Festkörperphysik, Ruhr-Universität Bochum, 44780 Bochum, Germany — 3Ioffe Institute, Polytechnicheskaya 26, 194021 St.-Petersburg, Russia
The hyperfine interaction between donor electron spins and lattice magnetic moments in III-V semiconductor materials is a challenge for quantum information processing. However, the ubiquitous interaction also provides all-optical access to the spin dynamics of the nuclear system, which may serve as long-lived solid-state qubits.
We present highly sensitive spin noise measurements on an ensemble of non-interacting donor bound electrons (D0X) in a nearly perfect, high purity Gallium Arsenide host matrix [1]. The experiment distinctly reveals the finite Overhauser shift of an electron spin precession at zero external magnetic field and a second contribution around zero frequency stemming from the electron spin components parallel to nuclear spin fluctuations. Moreover, at very low frequencies, features related with time-dependent nuclear spin fluctuations are clearly resolved making it possible to study the intricate nuclear spin dynamics at zero and low magnetic fields.
[1] Berski, et al., Phys. Rev. Lett. 115, 176601 (2015).