Controlling magnetism of semi-magnetic quantum dots with odd-even exciton numbersS.-J. Cheng1 and P. Hawrylak2
1 Department of Electrophysics, National Chiao Tung University - Hsinchu 300, Taiwan, Republic of China
2 Institute for Microstructural Sciences, National Research Council - Ottawa, Canada
received 11 August 2007; accepted in final form 29 November 2007; published February 2008
published online 7 January 2008
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.
78.67.Hc - Quantum dots.
75.75.+a - Magnetic properties of nanostructures.
71.35.Gg - Exciton-mediated interactions.
© EPLA 2008