Optical manipulation of a single Mn spin in a CdTe-based quantum dot

Abstract

A system of two coupled CdTe quantum dots, one of them containing a single Mn ion, was studied in continuous wave and modulated photoluminescence, photoluminescence excitation, and photon correlation experiments. Optical writing of information in the spin state of the Mn ion has been demonstrated, using orientation of the Mn spin by spin-polarized carriers transferred from the neighbor quantum dot. Mn spin orientation time values from 20 ns to 100 ns were measured, depending on the excitation power. Storage time of the information in the Mn spin was found to be enhanced by application of a static magnetic field of 1 T, reaching hundreds of microseconds in the dark. Simple rate equation models were found to describe correctly static and dynamical properties of the system.

4 pages, 3 figures

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• Optically probing the fine structure of a single Mn atom in an InAs quantum dot
• Excitation mechanisms of individual CdTe/ZnTe quantum dots studied by photon correlation spectroscopy
• Optically induced energy and spin transfer in non-resonantly coupled pairs of self-assembled CdTe/ZnTe quantum dots
• Optical probing of spin fluctuations of a single magnetic atom
• Magnetization dynamics down to zero field in dilute (Cd,Mn)Te quantum wells

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