Resonant suppression of exciton spin relaxation in Zn0.96Mn0.04Se/CdSe superlattices
2003 (English)In: Journal of Applied Physics, ISSN 0021-8979, Vol. 93, no 10, 7352- p.Article in journal (Refereed) Published
Spin relaxation processes in strained Zn0.96Mn0.04Se/CdSe superlattices are studied in detail by using hot photoluminescence combined with tunable excitation spectroscopy. A drastic enhancement in occupation of the upper-lying |+1/2,-3/2> state of the heavy-hole excitons is observed when excitation photon energy is resonantly tuned near an integer number of the LO phonon energy above the |+1/2,-3/2> state. Assuming the Boltzmann distribution between the excitonic states, the spin temperature of the excitons is deduced to be as high as 85 K, well above the lattice temperature of 2 K. The observed behavior provides experimental evidence for a surprisingly strong suppression of spin relaxation from the upper spin-split excitonic branch for small values of wave vector.
Place, publisher, year, edition, pages
2003. Vol. 93, no 10, 7352- p.
IdentifiersURN: urn:nbn:se:liu:diva-45050DOI: 10.1063/1.1556933Local ID: 79494OAI: oai:DiVA.org:liu-45050DiVA: diva2:265912