TY  - JOUR
A1  - Margapoti, E.
A1  - Alves, F. M.
A1  - Mahapatra, S.
A1  - Lopez-Richard, V.
A1  - Worschech, L.
A1  - Brunner, K.
A1  - Qu, F.
A1  - Destefani, C.
A1  - Menendez-Proupin, E.
A1  - Bougerol, C.
A1  - Forchel, A.
A1  - Marques, G. E.
T1  - Paramagnetic shift in thermally annealed Cd\(_x\)Zn\(_{1-x}\)Se quantum dots
JF  - New Journal of Physics
N2  - The photoluminescence of annealed Cd\(_x\)Zn\(_{1-x}\)Se quantum dots (QDs) under the influence of an external magnetic field has been studied in this paper. Post-growth annealing was performed for different annealing times. Above a critical annealing time, the QD luminescence shows a pronounced red-shift of the Zeeman split magnetic subcomponents. This observation is in contrast to the blue-shift caused by the diamagnetic behavior that is usually observed in non-magnetic QDs. We attribute our finding to the paramagnetism caused by the mixing of heavy and light hole states. Hence, post-growth thermal annealing treatment might be employed to render undoped epitaxial QDs intrinsically magnetic in a controlled manner. Two theoretical models were developed: a few-particle model to account for excitonic complex effects and a multiband calculation that describes the valence band hybridization. Contrasting the two models allowed us to unambiguously elucidate the nature of such an effect.
KW  - semiconductors
Y1  - 2012
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-133294
VL  - 14
IS  - 043038
ER  -