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Institut f. Physik
FG Nanostrukturierte Materialien
Martin-Luther-Universitat
Halle-Wittenberg
Von-Danckelmann-Platz 3,
D-06120 Halle, Germany

Tel.:  +49 345 55 25321
Fax.: +49 345 55 27034

[Veröffentlichungen] [Patente] [Graduierungsarbeiten] [Berichte] [Poster]
Abstract

C. Gould, A. Slobodskyy, T. Slobodskyy, P. Grabs, D. Supp, P. Hawrylak, F. Qu, G. Schmidt, L.W. Molenkamp
Remanent zero field spin splitting of self-assembled quantum dots in a paramagnetic host
Phys. Rev. Lett. 97 (2015-02-24 14:12:36), 17202

We report on the observation of a finite spin splitting at zero magnetic field in resonant tunneling experiments on CdSe self-assembled quantum dots in a (Zn,Be,Mn)Se barrier. This is remarkable since bulk II-VI dilute magnetic semiconductors are paramagnets. Our experiment may be viewed as tunneling through a single magnetic polaron, where the carriers contained inside the dot act to mediate an effective ferromagnetic interaction between Mn ions in their vicinity. The effect is observable up to relatively high temperatures, which we tentatively ascribe to a feedback mechanism with the electrical current, previously predicted theoretically.

http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.97.017202
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