Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
1998-05-07
J. Cryst. Growth 184/185 (1998) 325-329
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
9 pages, LaTeX2e article, epsfig (4 figures)
Scientific paper
Wide quantum dots were fabricated from multiple quantum well structures based on Zn_{1-x}Mn_xTe/ZnTe (x = 0.076) dilute magnetic semiconductors and were investigated via photoluminescence (PL) in a magnetic field. Calculations taking into account the strain in the two types of structure enabled the PL transitions to be identified and show that the dominant emission in the MQWs is from heavy-hole (hh) excitons whereas in the quantum dots, the removal of the strain in the barrier layers generates a large biaxial tensile strain in the quantum wells which shifts the light-hole (lh) exciton to lower energy than the hh exciton. The lh exciton sigma^+ transition is virtually independent of magnetic field whilst the hh exciton is field-dependent. Thus, at fields of 1 to 2 Tesla, the hh exciton sigma^+ transition again becomes the lowest energy transition of the quantum dots. These observations are described by a model with a chemical valence band offset of 30% for Zn_{1-x}Mn_xTe/ZnTe.
Ashenford Duncan E.
Davies John J.
Griffin Ivan J.
Henning Torsten
Klar Peter J.
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