title: Optical emission of a strained direct-band-gap Ge quantum well embedded inside InGaAs alloy layers.
abstract: We studied the optical properties of a strain-induced direct-band-gap Ge quantum well embedded in InGaAs. We showed that the band offsets depend on the electronegativity of the layer in contact with Ge, leading to different types of optical transitions in the heterostructure. When group-V atoms compose the interfaces, only electrons are confined in Ge, whereas both carriers are confined when the interface consists of group-III atoms. The different carrier confinement results in different emission dynamics behavior. This study provides a solution to obtain efficient light emission from Ge.
authors.affiliation: Tyndall National Institute, University College Cork, Lee Maltings, Cork, Ireland.
authors.forename: N
authors.initials: N
authors.lastname: Pavarelli
authors.forename: T J
authors.initials: TJ
authors.lastname: Ochalski
authors.forename: F
authors.initials: F
authors.lastname: Murphy-Armando
authors.forename: Y
authors.initials: Y
authors.lastname: Huo
authors.forename: M
authors.initials: M
authors.lastname: Schmidt
authors.forename: G
authors.initials: G
authors.lastname: Huyet
authors.forename: J S
authors.initials: JS
authors.lastname: Harris