title: Effects of crossed states on photoluminescence excitation spectroscopy of InAs quantum dots.
abstract: In this report, the influence of the intrinsic transitions between bound-to-delocalized states (crossed states or quasicontinuous density of electron-hole states) on photoluminescence excitation (PLE) spectra of InAs quantum dots (QDs) was investigated. The InAs QDs were different in size, shape, and number of bound states. Results from the PLE spectroscopy at low temperature and under a high magnetic field (up to 14 T) were compared. Our findings show that the profile of the PLE resonances associated with the bound transitions disintegrated and broadened. This was attributed to the coupling of the localized QD excited states to the crossed states and scattering of longitudinal acoustical (LA) phonons. The degree of spectral linewidth broadening was larger for the excited state in smaller QDs because of the higher crossed joint density of states and scattering rate.
authors.affiliation: Institute of Nanoscience, National Chung Hsing University, 250 Kuo Kuang Rd,, Taichung 402, Taiwan. ysuen@phys.nchu.edu.tw.
authors.forename: Ching-I
authors.initials: CI
authors.lastname: Shih
authors.forename: Chien-Hung
authors.initials: CH
authors.lastname: Lin
authors.forename: Shin-Chin
authors.initials: SC
authors.lastname: Lin
authors.forename: Ta-Chun
authors.initials: TC
authors.lastname: Lin
authors.forename: Kien Wen
authors.initials: KW
authors.lastname: Sun
authors.forename: Oleksandr Alex
authors.initials: OA
authors.lastname: Voskoboynikov
authors.forename: Chien-Ping
authors.initials: CP
authors.lastname: Lee
authors.forename: Yuen-Wuu
authors.initials: YW
authors.lastname: Suen