Resonant optical control of the spin of a single Cr atom in a quantum dot

Abstract

A Cr atom in a semiconductor host carries a localized spin with an intrinsic large spin to strain coupling particularly promising for the development of hybrid spin-mechanical systems and coherent mechanical spin driving. We demonstrate here that the spin of an individual Cr atom inserted in a semiconductor quantum dot can be controlled optically. We first show that a Cr spin can be prepared by resonant optical pumping. Monitoring the time dependence of the intensity of the resonant fluorescence of the quantum dot during this process permits to probe the dynamics of the optical initialization of the Cr spin. Using this initialization and read-out technique we measured a Cr spin relaxation time at T=5 K of about 2 microseconds. We finally demonstrate that, under a resonant single mode laser field, the energy of any spin state of an individual Cr atom can be independently tuned by using the optical Stark effect.

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Cited by in corpus (6)

• Influence of non-equilibrium phonons on the spin dynamics of a single Cr atom
• Optical control of an individual Cr spin in a semiconductor quantum dot
• Fine structure of an exciton coupled to a single Fe2+ ion in a CdSe/ZnSe quantum dot
• Charge fluctuations of a Cr atom probed in the optical spectra of a quantum dot
• Deterministic photon storage and readout in a semimagnetic quantum-dot--cavity system doped with a single Mn ion
• Readout of a dopant spin in the anisotropic quantum dot with a single magnetic ion