We demonstrate a method which can hyperpolarize both the electron and nuclear spins of P31 donors in Si at low field, where both would be essentially unpolarized in equilibrium. It is based on the selective ionization of donors in a specific hyperfine state by optically pumping donor bound exciton hyperfine transitions, which can be spectrally resolved in Si28. Electron and nuclear polarizations of 90% and 76%, respectively, are obtained in less than a second, providing an initialization mechanism for qubits based on these spins, and enabling further ESR and NMR studies on dilute P31 in Si28.
ASJC Scopus subject areas
- Physics and Astronomy(all)