Excitonic enhancement of spin relaxation in diluted magnetic semiconductor quantum wells

Autor:	B Bert Koopmans, de Wjm Wim Jonge, van Sca Driel, van M Maarten Kampen, Cjp Coen Smits, Grzegorz Karczewski
Přispěvatelé:	Physics of Nanostructures, Eindhoven Hendrik Casimir institute
Rok vydání:	2004
Předmět:	Magnetization Materials science Condensed matter physics Exciton Bound state Relaxation (NMR) Electron Magnetic semiconductor Condensed Matter Physics Spin (physics) Quantum well Electronic Optical and Magnetic Materials
Zdroj:	Physical Review B, 70(11):115307, 115307-1/8. American Physical Society
ISSN:	1550-235X 1098-0121
DOI:	10.1103/physrevb.70.115307
Popis:	We performed pump-probe magneto-optical Kerr spectroscopy to explore the role of excitonic effects on the electron and hole spin relaxation in Cd1˛xMnxTe-based quantum well structures. Particularly, important information is obtained from detailed interpretation of the temperature and wavelength dependence of the observed transient magneto-optics in specially engineered structures. In manganese-rich wells the electron spin relaxation is found to be strongly enhanced in the exciton due to the increased mass of the bound electron-hole pair, in agreement with earlier predictions. An even stronger enhancement of the relaxation time is found for the hole spin, which is explained by the additional mixing of heavy-hole and light-hole states in the bound state. In structures where Mn is confined to the barrier region, a different behavior is observed, indicative for a competition of various contributions.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1a8c8a100d65a2a5f3708e507147ee3d https://doi.org/10.1103/physrevb.70.115307 Zobrazit plný text záznamu