title: Broadband optical non-linearity induced by charge-transfer excitons in type-II CdSe/ZnTe nanocrystals.
abstract: Benefiting from excitonic charge-transfer states, an efficient non-linear optical response is observed in type-II nanocrystals by four-wave mixing when the incident photon energy lies below the bandgaps of constituent semiconductors. The non-linear optical properties in nanocrystals can be manipulated by the band alignment of the core-shell components, which serves as a promising platform to design broadband non-linear optical devices.
authors.affiliation: National Laboratory of Solid State Microstructures, School of Physics, School of Engineering and Applied Science, Nanjing University, Nanjing, China.
authors.forename: Yunlong
authors.initials: Y
authors.lastname: Liu
authors.forename: Chunfeng
authors.initials: C
authors.lastname: Zhang
authors.forename: Huichao
authors.initials: H
authors.lastname: Zhang
authors.forename: Rui
authors.initials: R
authors.lastname: Wang
authors.forename: Zheng
authors.initials: Z
authors.lastname: Hua
authors.forename: Xiaoyong
authors.initials: X
authors.lastname: Wang
authors.forename: Jiayu
authors.initials: J
authors.lastname: Zhang
authors.forename: Min
authors.initials: M
authors.lastname: Xiao
keywords: charge-transfer excitons; four-wave mixing; optical non-linearity; state filling; type-II nanocrystals