Spin dynamics of an individual Cr atom in a semiconductor quantum dot under optical excitation

Abstract

We studied the spin dynamics of a Cr atom incorporated in a II-VI semiconductor quantum dot using photon correlation techniques. We used recently developed singly Cr-doped CdTe/ZnTe quantum dots (A. Lafuente-Sampietro {\it et al.}, [1]) to access the spin of an individual magnetic atom. Auto-correlation of the photons emitted by the quantum dot under continuous wave optical excitation reveals fluctuations of the localized spin with a timescale in the 10 ns range. Cross-correlation gives quantitative transfer time between Cr spin states. A calculation of the time dependence of the spin levels population in Cr-doped quantum dots shows that the observed spin dynamics is controlled by the exciton-Cr interaction. These measurements also provide a lower bound in the 20 ns range for the intrinsic Cr spin relaxation time.

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Cited by in corpus (6)

• Direct determination of zero-field splitting for single Co${}^{2+}$ ion embedded in a CdTe/ZnTe quantum dot
• Fine structure of an exciton coupled to a single Fe2+ ion in a CdSe/ZnSe quantum dot
• Single vanadium ion magnetic dopant in an individual CdTe/ZnTe quantum dot
• Spin dynamics of positively charged excitons in Cr${}^{+}$-doped quantum dots probed by resonant photoluminescence
• Deterministic photon storage and readout in a semimagnetic quantum-dot--cavity system doped with a single Mn ion
• Mechanisms of optical orientation of an individual Mn${}^{2+}$ ion spin in a II-VI quantum dot