title: Electron spin coherence near room temperature in magnetic quantum dots.
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 (TM ~ 8 μs) and spin-lattice relaxation (T1 ~ 10 ms) time constants for Mn(2+) ions at T = 4.5 K, and in electron spin coherence observable near room temperature (TM ~ 1 μs).
authors.affiliation: School of Physics and Astronomy, The University of Nottingham, University Park, Nottingham NG7 2RD, UK.
authors.forename: Fabrizio
authors.initials: F
authors.lastname: Moro
authors.affiliation: School of Physics and Astronomy, The University of Nottingham, University Park, Nottingham NG7 2RD, UK.
authors.forename: Lyudmila
authors.initials: L
authors.lastname: Turyanska
authors.affiliation: School of Physics and Astronomy, The University of Nottingham, University Park, Nottingham NG7 2RD, UK.
authors.forename: James
authors.initials: J
authors.lastname: Wilman
authors.affiliation: School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
authors.forename: Alistair J
authors.initials: AJ
authors.lastname: Fielding
authors.affiliation: Nottingham Nanotechnology and Nanoscience Centre, University Park, Nottingham NG7 2RD, UK.
authors.forename: Michael W
authors.initials: MW
authors.lastname: Fay
authors.affiliation: Institute of Energy and Climate Research (IEK-9), Forschungszentrum Juelich, Juelich D-52425, Germany.
authors.forename: Josef
authors.initials: J
authors.lastname: Granwehr
authors.affiliation: School of Physics and Astronomy, The University of Nottingham, University Park, Nottingham NG7 2RD, UK.
authors.forename: Amalia
authors.initials: A
authors.lastname: Patanè