title: Formation dynamics of excitons and temporal behaviors of Fano resonance due to the exciton-impurity-phonon configuration interaction in ZnO.
abstract: Formation dynamics of free and neutral donor bound excitons (FX and D(0)X) in a high quality ZnO single crystal are studied by means of time-resolved photoluminescence (TRPL) at various temperatures. At low-temperatures, FX and D(0)X formation times are determined to be ~5 and ~10 ps, respectively, by fitting the rise process with the Boltzmann sigmoidal function. Temporal information of FX- and D(0)X-longitudinal optical (LO) phonon coupling is also acquired by measuring TRPL spectra of the first-order LO phonon-assisted FX and D(0)X transitions. In particular, interesting time evolution of luminescence intensity in the Fano resonance region due to the configuration interaction of exciton-impurity-phonon is explored.
authors.affiliation: Department of Physics and HKU-CAS Joint Laboratory on New Materials, The University of Hong Kong, Pokfulam Road, Hong Kong, China.
authors.forename: C C
authors.initials: CC
authors.lastname: Zheng
authors.forename: S J
authors.initials: SJ
authors.lastname: Xu
authors.forename: J Q
authors.initials: JQ
authors.lastname: Ning
authors.forename: Y N
authors.initials: YN
authors.lastname: Chen
authors.forename: B K
authors.initials: BK
authors.lastname: Li
authors.forename: J N
authors.initials: JN
authors.lastname: Wang
authors.forename: C M
authors.initials: CM
authors.lastname: Che