title: Fast nuclear spin hyperpolarization of phosphorus in silicon.
abstract: 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.
authors.affiliation: Department of Physics, University of Utah, 115 South 1400 East Rm 201, Salt Lake City, Utah 84112, USA.
authors.forename: D R
authors.initials: DR
authors.lastname: McCamey
authors.forename: J
authors.initials: J
authors.lastname: van Tol
authors.forename: G W
authors.initials: GW
authors.lastname: Morley
authors.forename: C
authors.initials: C
authors.lastname: Boehme