Magnetic ground state of an individual Fe2+ ion in strained semiconductor nanostructure

T. Smoleński (), T. Kazimierczuk (), J. Kobak, M. Goryca, A. Golnik, P. Kossacki and W. Pacuski ()
Additional contact information
T. Smoleński: Institute of Experimental Physics, Faculty of Physics, University of Warsaw
T. Kazimierczuk: Institute of Experimental Physics, Faculty of Physics, University of Warsaw
J. Kobak: Institute of Experimental Physics, Faculty of Physics, University of Warsaw
M. Goryca: Institute of Experimental Physics, Faculty of Physics, University of Warsaw
A. Golnik: Institute of Experimental Physics, Faculty of Physics, University of Warsaw
P. Kossacki: Institute of Experimental Physics, Faculty of Physics, University of Warsaw
W. Pacuski: Institute of Experimental Physics, Faculty of Physics, University of Warsaw

Nature Communications, 2016, vol. 7, issue 1, 1-7

Abstract: Abstract Single impurities with nonzero spin and multiple ground states offer a degree of freedom that can be utilized to store the quantum information. However, Fe2+ dopant is known for having a single nondegenerate ground state in the bulk host semiconductors and thus is of little use for spintronic applications. Here we show that the well-established picture of Fe2+ spin configuration can be modified by subjecting the Fe2+ ion to high strain, for example, produced by lattice mismatched epitaxial nanostructures. Our analysis reveals that high strain induces qualitative change in the ion energy spectrum and results in nearly doubly degenerate ground state with spin projection Sz=±2. We provide an experimental proof of this concept using a new system: a strained epitaxial quantum dot containing individual Fe2+ ion. Magnetic character of the Fe2+ ground state in a CdSe/ZnSe dot is revealed in photoluminescence experiments by exploiting a coupling between a confined exciton and the single-iron impurity. We also demonstrate that the Fe2+ spin can be oriented by spin-polarized excitons, which opens a possibility of using it as an optically controllable two-level system free of nuclear spin fluctuations.

Date: 2016
References: Add references at CitEc
Citations:

Downloads: (external link)
https://www.nature.com/articles/ncomms10484 Abstract (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms10484

Ordering information: This journal article can be ordered from
https://www.nature.com/ncomms/

DOI: 10.1038/ncomms10484

Access Statistics for this article

Nature Communications is currently edited by Nathalie Le Bot, Enda Bergin and Fiona Gillespie

More articles in Nature Communications from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().