We report on an example of confined magnetic ions with long spin coherence near room temperature. This was achieved by confining single Mn 2+ spins in colloidal semiconductor quantum dots (QDs) and by dispersing the QDs in a proton-spin free matrix. The controlled suppression of Mn-Mn interactions and minimization of Mn-nuclear spin dipolar interactions result in unprecedentedly long phase memory (T M ∼8μs) and spin-lattice relaxation (T 1 ∼10ms) time constants for Mn 2+ ions at T=4.5K, and in electron spin coherence observable near room temperature (T M ∼1μs).
Moro, F., Turyanska, L., Wilman, J., Fielding, A., Fay, M., Granwehr, J., et al. (2015). Electron spin coherence near room temperature in magnetic quantum dots. SCIENTIFIC REPORTS, 5 [10.1038/srep10855].
Electron spin coherence near room temperature in magnetic quantum dots
Moro, Fabrizio
;
2015
Abstract
We report on an example of confined magnetic ions with long spin coherence near room temperature. This was achieved by confining single Mn 2+ spins in colloidal semiconductor quantum dots (QDs) and by dispersing the QDs in a proton-spin free matrix. The controlled suppression of Mn-Mn interactions and minimization of Mn-nuclear spin dipolar interactions result in unprecedentedly long phase memory (T M ∼8μs) and spin-lattice relaxation (T 1 ∼10ms) time constants for Mn 2+ ions at T=4.5K, and in electron spin coherence observable near room temperature (T M ∼1μs).
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