Patryk Gumann: Nuclear Spin Polarization of low concentration of 31-P in Silicon

Patryk Gumann, IQC

Abstract

Nuclear magnetic resonance (NMR) signal of phosphorus donors ($^{31}$P) in a single crystal of silicon, concentration 6 x 10$^{15}$ cc$^{-1}$ has been measured. The obtained polarization is larger than the expected thermal equilibrium polarization within the time scale of the experiment. A 13 sec build up time a probable nonequilibrium Overhauser mechanism, driven by 1047 nm light irradiation. This polarization is reached a temperature of 4.2 K and a magnetic field of 9.4 T.