Optical pumping and a nondestructive readout of a single magnetic impurity spin in an InAs/GaAs quantum dot

• Published in: Physical review letters Vol. 107; no. 19; p. 197402
• Main Authors: Baudin, E, Benjamin, E, Lemaître, A, Krebs, O
• Format: Journal Article
• Language: English
• Published: United States American Physical Society 04-11-2011
• Subjects: Condensed Matter; Other; Physics
• ISSN: 0031-9007; 1079-7114
• DOI: 10.1103/PhysRevLett.107.197402

We report on the resonant optical pumping of the | ± 1⟩ spin states of a single Mn dopant in an InAs/GaAs quantum dot which is embedded in a charge tunable device. The experiment relies on a W scheme of transitions reached when a suitable longitudinal magnetic field is applied. The optical pumping is achieved via the resonant excitation of the central Λ system at the neutral exciton X(0) energy. For a specific gate voltage, the redshifted photoluminescence of the charged exciton X- is observed, which allows a nondestructive readout of the spin polarization. An arbitrary spin preparation in the | + 1⟩ or |-1⟩ state characterized by a polarization near or above 50% is evidenced.