Controlling magnetism of semi-magnetic quantum dots with odd-even exciton numbers

Shun-Jen Cheng*, P. Hawrylak

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

We present a theory of optical control of magnetism in a self-assembled quantum dot (SAD) containing magnetic ions. We show that the magnetic state of Mn ions can be controlled by the number of excitons in the dot. For an odd number of excitons the magnetic ions are coupled by the spins of valence holes and electrons. For an even number of excitons we derive the effective RKKY interaction between Mn ions, and show that it is controlled by valence holes. We predict the emission spectra of the coupled Mn-exciton system and relate them to the magnetic state of ions and the number of excitons in the quantum dot.

Original languageEnglish
Article number37005
JournalEPL
Volume81
Issue number3
DOIs
StatePublished - 1 Feb 2008

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