Fast nuclear spin hyperpolarization of phosphorus in silicon.
We experimentally demonstrate a method for obtaining nuclear spin hyperpolarization, that is, polarization significantly in excess of that expected at thermal equilibrium. By exploiting a nonequilibrium Overhauser process, driven by white light irradiation, we obtain more than 68% negative nuclear polarization of phosphorus donors in silicon. This polarization is reached with a time constant of approximately 150 sec, at a temperature of 1.37 K and a magnetic field of 8.5 T. The ability to obtain such large polarizations is discussed with regards to its significance for quantum information processing and magnetic resonance imaging.
McCamey
D R
DR
Department of Physics, University of Utah, 115 South 1400 East Rm 201, Salt Lake City, Utah 84112, USA.
van Tol
J
J
Morley
G W
GW
Boehme
C
C