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Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 35: Poster I

HL 35.10: Poster

Dienstag, 8. März 2016, 15:00–19:00, Poster A

Low magnetic field wavelength modulation absorption spectroscopy of donor bound excitons in 28Si:P — •Michael Beck1, Helge Riemann2, Jens Hübner1, and Michael Oestreich11Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstrasse 2, D-30167 Hannover — 2Leibniz Institut für Kristallzüchtung, Max-Born-Strasse 2, D-12489 Berlin

Donor atoms in a crystalline silicon host are promising candidates for the implementation of quantum information devices [1]. The decoupling of donor atoms from the nuclear spin bath of the host lattice by means of isotopical enrichment leads to very long coherence times of donor electron spins [2]. We will employ non-perturbative spin noise spectroscopy [3] to unveil the intrinsic spin dynamics of donor bound electrons in weakly doped 28Si:P in the millikelvin temperature regime. As preparatory measurements, we investigate the electronic structure of the donor-bound exciton in a magnetic field by means of modulation absorption spectroscopy, which allows for a determination of the oscillator strength and fine structure. The ultra-narrow linewidth [4] of the bound exciton transition furthermore reveals the magnetic field dependence of the electron and hole Landé
g-factor at low magnetic fields.

[1] B.E. Kane, Nature 393, 133 (1998).
A.M. Tyryshkin et al., Nature Matter. 11, 143, (2012).
J. Hübner et al., Phys. Stat. Solidi (B) 251, 1824 (2014).
M. L. W. Thewalt et al., J. Appl. Phys. 101, 081724 (2007).

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