Optical properties of epitaxially grown submonolayer CdSe/ZnSe nanostructures

2020-02-01 04:42:36

excitation nanostructures CdSe phonon exciton

责任者: Kapitonov, A.M.;Itoh, T.;Woggon, U.;Kayser, D.;Hommel, D. 单位: Graduate Sch. of Eng. Sci., Osaka Univ., Toyonaka, Japan 来源出处: Physical Review B (Condensed Matter and Materials Physics)(Phys. Rev., B, Condens, Matter Mater. Phys. (USA)),2004/11/15,70(19):195304-1 摘要: The optical properties of epitaxially grown CdSe/ZnSe nanostructures with nominal CdSe coverage between 0.15 monolayer (ML) and 0.58 ML are investigated by photoluminescence (PL) and PL excitation spectroscopy at low and high excitation density, time-resolved PL, temperature dependent linewidth analysis, and two-photon excitation spectroscopy. We discuss exciton-phonon complexes in a potential and analyze their dominant dimensionality. The exciton-polaron picture, which is mostly applied to the extreme case of very strong exciton-phonon coupling, is introduced here as a well-suited description of the optical properties of ultra-small semiconductor nanostructures with relaxed quantum confinement 关键词: cadmium compounds;II-VI semiconductors;monolayers;nanostructured materials;phonon-exciton interactions;photoluminescence;polarons;semiconductor epitaxial layers;spectral line breadth;time resolved spectra;two-photon spectra;zinc compounds;optical properties;epitaxially grown submonolayer;CdSe/ZnSe nanostructures;photoluminesence excitation spectroscopy;excitation density;time-resolved photoluminesence;temperature dependent linewidth analysis;two-photon excitation spectroscopy;exciton-phonon complexes;exciton-polaron picture;exciton-phonon coupling;quantum confinement;CdSe-ZnSe