Electron spin coherence near room temperature in magnetic quantum dots

Fabrizio Moro; Lyudmila Turyanska; James Wilman; Alistair J Fielding; Michael W Fay; Josef Granwehr; Amalia Patanè

doi:10.1038/srep10855

Electron spin coherence near room temperature in magnetic quantum dots

Sci Rep. 2015 Jun 4:5:10855. doi: 10.1038/srep10855.

Authors

Fabrizio Moro¹, Lyudmila Turyanska¹, James Wilman¹, Alistair J Fielding², Michael W Fay³, Josef Granwehr⁴, Amalia Patanè¹

Affiliations

¹ School of Physics and Astronomy, The University of Nottingham, University Park, Nottingham NG7 2RD, UK.
² School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
³ Nottingham Nanotechnology and Nanoscience Centre, University Park, Nottingham NG7 2RD, UK.
⁴ Institute of Energy and Climate Research (IEK-9), Forschungszentrum Juelich, Juelich D-52425, Germany.

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).

Publication types

Research Support, Non-U.S. Gov't