Dresden 2017 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 63: Poster: Quantum Dots and Optics

HL 63.31: Poster

Wednesday, March 22, 2017, 15:00–19:00, P1A

Probe laser induced spin polarization of donor bound electrons in ²⁸Si:P — •Michael Beck¹, Nikolay Abrosimov², Jens Hübner¹, and Michael Oestreich¹ — ¹Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstrasse 2, D-30167 Hannover — ²Leibniz Institut für Kristallzüchtung, Max-Born-Strasse 2, D-12489 Berlin

The decoupling of donor atoms from the nuclear spin bath of the host lattice in isotopically enriched silicon leads to very long coherence times of donor electron spins [1]. The exceptional purity of this system also entails an ultra narrow optical linewidth and well resolvable hyperfine splitting of the donor bound exciton transition [2] which is commonly used to probe spin properties of the localized electron ensemble [3]. We employ Faraday rotation spectroscopy and observe a strong spin polarization caused by the linearly polarized probe laser only [4]. The findings are explained by supplemental phase modulation absorption spectroscopy which reveals the evolution of the hyperfine coupled states in small magnetic fields.

[1] A.M. Tyryshkin et al., Nature Matter. 11, 143, (2012).
M. L. W. Thewalt et al. J. Appl. Phys. 101, 081724 (2007).
J. Hübner et al., Phys. Stat. Solidi (B), 251, 1824 (2014).
[4] A. Yang et al., Phys. Rev. Lett. 102, 257401 (2009).