title: Origin of quantum ring formation during droplet epitaxy.
abstract: Droplet epitaxy of GaAs is studied in real time using in situ surface electron microscopy. The resulting movies motivate a theoretical model for quantum ring formation which can explain the origin of nanoscale features such as double rings observed under a variety of experimental conditions. Inner rings correspond to GaAs deposition at the droplet edge, while outer rings result from the reaction of Ga and As atoms diffusing along the surface. The observed variety of morphologies primarily reflects relative changes in the outer rings with temperature and As flux.
authors.affiliation: School of Physics, Monash University, Victoria 3800, Australia.
authors.forename: Z Y
authors.initials: ZY
authors.lastname: Zhou
authors.forename: C X
authors.initials: CX
authors.lastname: Zheng
authors.forename: W X
authors.initials: WX
authors.lastname: Tang
authors.forename: J
authors.initials: J
authors.lastname: Tersoff
authors.forename: D E
authors.initials: DE
authors.lastname: Jesson