QFS2016 Book of Abstracts

Abstracts

P4.38 Dynamic nuclear polarization and control of 29-Si nuclear spins in As doped Si J¨arvinen J.(1), Vasiliev S.(1), Ahokas J.(1), Sheludyakov S.(1), Vainio O.(1), Vlasenko L.(2) 1) University of Turku, Department of Physics and Astronomy, 20014 University of Turku, Finland 2) A. F. Ioffe Physico-Technical Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia We report on experiments of dynamic nuclear polarization (DNP) of donor and 29Si nuclear spins in natural silicon. We demonstrate very high polarization of 29Si nuclei which are strongly coupled to donor electrons. By utilizing the methods of DNP it is possible to select spin ensembles based on the strength of 29Si superhyperfine interaction with the donor electron. The ensembles can be further manipulated with NMR. The samples were studied in strong magnetic field of 4.6 T and temperatures below 1 K, in which conditions the donor electron spins are fully polarized. P4.39 Crystalization of 4 He in Aerogel via Mass Flow from Surrounding Solid 4 He Ryuji Nomura Tokyo Institue of Technology

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