Exciton Spectroscopy of Single CdTe and CdMnTe Quantum Dots

• Published in: Physica status solidi. B. Basic research Vol. 229; no. 1; pp. 493 - 496
• Main Authors: Maćkowski, S., Wróbel, J., Fronc, K., Kossut, J., Pulizzi, F., Christianen, P.C.M., Maan, J.C., Karczewski, G.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Berlin WILEY-VCH Verlag Berlin GmbH 01.01.2002; WILEY‐VCH Verlag Berlin GmbH; Wiley
• Subjects: 68.65.Hb; 71.35.Ji; 71.70.Gm; 78.55.Et; 78.67.Hc; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Electron states; Exact sciences and technology; Level splitting and interactions; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures; Physics; Quantum dots; S8.13; Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect; Spin-orbit coupling, zeeman, stark, and strain splitting, jahn-teller effect; Confinement; Inorganic compounds; Semiconductor materials; Manganese tellurides; Quantum dots; Ternary compounds; Transition element compounds; Line splitting; Magnetic field effects; Line widths; Binary compounds; Self-assembled layers; g-factor; Zeeman effect; Excitons; Ordered systems; Cadmium tellurides; Magnetic structure; Energy-level splitting; Exchange interactions
• ISSN: 0370-1972; 1521-3951
• DOI: 10.1002/1521-3951(200201)229:1<493::AID-PSSB493>3.0.CO;2-8

Single dot optical spectroscopy results obtained for CdTe and CdMnTe self‐assembled quantum dots in ZnTe matrix are reported. In order to resolve the emission from individual dots apertures with diameter below 200 nm were opened in a metal masks. In the case of CdTe dots, sharp emission lines with a linewidth below 200 μeV were observed. From a magnetic field dependence of the emission energy the exciton effective g‐factor is deduced to be equal to —3 and it is found to be independent of the energy of the quantum dot emission at B = 0 T. On the other hand, for CdMnTe quantum dots, broad (∼3–5 meV) emission lines related to a single dot emission were observed. Moreover, the Zeeman splitting of these lines is found to be comparable with their linewidth. The observed behavior is attributed to either high manganese concentration in the dots or to confinement induced decrease of exchange constants in magnetic quantum structures.