Moro Fabrizio, Turyanska Lyudmila, Wilman James, Fielding Alistair J, Fay Michael W, Granwehr Josef, Patanè Amalia
School of Physics and Astronomy, The University of Nottingham, University Park, Nottingham NG7 2RD, UK.
School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
Sci Rep. 2015 Jun 4;5:10855. doi: 10.1038/srep10855.
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).
我们报道了一个在接近室温时具有长自旋相干性的受限磁性离子的例子。这是通过将单个Mn(2+)自旋限制在胶体半导体量子点（QD）中，并将量子点分散在无质子自旋的基质中来实现的。对Mn-Mn相互作用的可控抑制以及Mn-核自旋偶极相互作用的最小化，使得在T = 4.5 K时Mn(2+)离子具有前所未有的长相干时间（TM ~ 8 μs）和自旋-晶格弛豫时间（T1 ~ 10 ms），并且在接近室温时可观测到电子自旋相干（TM ~ 1 μs）。
