title: Controlled formation of GeSi nanostructures on periodic Si (001) sub-micro pillars.
abstract: Self-assembled GeSi nanostructures on periodic Si (001) sub-micro pillars (SMPs) are systematically studied. Different GeSi nanostructures, including circularly arranged quantum dots, quantum rings and quantum dot molecules can be readily obtained at the edge of the pillars by controlling the growth temperatures and the diameter of the pillar. These phenomena are explained by taking into account the surface chemical potential around the top terrace of SMPs, which is considerably affected by the formation of {113} facets. Our results demonstrate a feasible route to obtain novel periodic Si pillars embedded with the desired GeSi nanostructures, which have promising applications in optoelectronic devices.
authors.affiliation: State Key Laboratory of Surface Physics, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education) and Department of Physics, Fudan University, Shanghai 200433, China. zhenyangz@fudan.edu.cn.
authors.forename: Tong
authors.initials: T
authors.lastname: Zhou
authors.forename: Cheng
authors.initials: C
authors.lastname: Zeng
authors.forename: Qianqian
authors.initials: Q
authors.lastname: Ma
authors.forename: Yingjie
authors.initials: Y
authors.lastname: Ma
authors.forename: Yongliang
authors.initials: Y
authors.lastname: Fan
authors.forename: Zuimin
authors.initials: Z
authors.lastname: Jiang
authors.forename: Jinsong
authors.initials: J
authors.lastname: Xia
authors.forename: Zhenyang
authors.initials: Z
authors.lastname: Zhong