Title
The breakdown of Kohn's theorem in few-electron parabolic quantum dots doped with a single magnetic impurity <tex>$Mn^{2+}$</tex> The breakdown of Kohn's theorem in few-electron parabolic quantum dots doped with a single magnetic impurity <tex>$Mn^{2+}$</tex>
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
conferenceObject
Publication
Bristol ,
Subject
Physics
Engineering sciences. Technology
Source (journal)
Journal of physics : conference series. - Bristol
Source (book)
Conference on Quantum Dots 2010 (QD2010), APR 26-30, 2010, Nottingham, ENGLAND
Volume/pages
245(2010) , p. 1-4
ISSN
1742-6588
1742-6596
Article Reference
012031
Carrier
E-only publicatie
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
The cyclotron resonance (CR) absorption spectrum is calculated for a II-VI parabolic quantum dot (QD) containing few electrons and a single magnetic dopant (Mn(2+)). We find that Kohn's theorem no longer holds for this system and that the CR spectrum depends on the number of electrons inside the QD. The electron-Mn-ion interaction strength can be tuned for example by the magnetic field and by moving the Mn-ion to different positions inside the QD. We demonstrate that due to the presence of the Mn-ion the relative motion of the electrons couple with their center-of-mass motion through the electron-Mn-ion spin-spin exchange term resulting in an electron-electron interaction dependence of the magneto-optical absorption spectrum. At the ferromagnetic-antiferromagnetic transition we observe significant discontinuities in the CR lines.
Full text (open access)
https://repository.uantwerpen.be/docman/irua/976100/6371.pdf
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