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HL: Fachverband Halbleiterphysik

HL 90: Poster III

HL 90.37: Poster

Donnerstag, 10. März 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)