Regensburg 2016 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 90: Poster III
HL 90.37: Poster
Thursday, March 10, 2016, 16:00–19:00, Poster A
Influence of 29Si nuclear spins on the coherence of ionized phosphorus donors in silicon — •Andreas M. Rauscher, David P. Franke, and Martin S. Brandt — Walter Schottky Institut and Physik-Department, Technische Universität München, Am Coulombwall 4, 85748 Garching, Germany
The fragility of quantum mechanical states is one of the main obstacles for the physical implementation of quantum bits (qubits). Promising candidates for the latter are the spins of impurities in silicon. In this case, the interaction with 29Si nuclear spins generally acts as the main source of decoherence. Removing this isotope in isotopically controlled 28Si, a record-breaking coherence time of 39 minutes for 31P+ nuclear spins has been achieved[1]. Using pulsed electrically detected magnetic resonance (pEDMR) and electron nuclear double resonance (ENDOR), we are able to access the nuclear spin states of both 31P+ and 29Si in γ-irradiated silicon with natural isotope composition, based on spin pairs formed between donors and irradiation defects (SL1)[2]. Here, we apply hyperpolarization techniques demonstrated on 31P+[3] to 29Si coupled to SL1 and the possibility to use this approach to systematically study the effects of 29Si spins on the decoherence of 31P+ nuclei.
[1] Kamyar Saeedi et al., Science 342, 830 (2013)
[2] David P. Franke et al., Phys. Rev. B 89, 195207 (2014)
[3] Felix Hoehne et al., Phys. Rev. Lett. 114, 117602 (2015)