Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 41: Spintronics: Excitons and Local Spins (jointly with HL, MA)
TT 41.5: Vortrag
Dienstag, 17. März 2015, 10:30–10:45, ER 270
Distinct Nuclear Spin Signatures in the Spin Noise of Donor Bound Electrons — •Fabian Berski1, Pavel Sterin1, Jens Hübner1, Andreas Wieck2, and Michael Oestreich1 — 1Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstr. 2, D-30167 Hannover, Germany — 2Ruhr-Universität Bochum, Angewandte Festkörperphysik, Universitätsstr. 150, D-44780 Bochum, Germany
The hyperfine interaction acts as a main source of decoherence for localized electron spins in III-V semiconductor material systems and is thus a challenge for quantum information processing [1]. However, this interaction can also serve as a subtle probe of nuclear dynamics, which manifests itself in the spin dynamics of electrons.
Here, we study an ensemble of non-interacting donor bound electrons (D0X) in a strain-free, high purity Gallium Arsenide host matrix, and find intriguing features of the nuclear spin dynamics in the electronic spin noise. The ideal tool to study such an interplay is spin noise spectroscopy, since it allows to control the dissipated amount of energy in the system and is a potential quantum non-demolition measurement [2]. However, by selecting the detuning between the D0X transition and the energy of the used laser light, we find strong evidence for a significant nuclear polarization, even at low laser power, linearly polarized light and vanishingly small transversal magnetic fields.
[1] Chekhovich, et al., Nature Mat. 12, 6 (2013).
[2] Hübner, et al., Phys Status Solidi B 251, 1824 (2014).