Formation of InAs Self-Assembled Quantum Rings on InP
arXiv:cond-mat/0210631 · doi:10.1063/1.1560868
Abstract
Shape transformations of partially capped self-assembled InAs quantum dots grown on InP are studied. Atomic force microscopy images show large anisotropic redistribution of the island material after coverage by a 1 nm thick InP layer. The anisotropic material redistribution occurs within a few minutes and leads to a change from lens-like to elongated ring-like islands. The shape transformation is not accompanied by dot material compositional change. The formation of InAs/InP quantum rings disagrees with a previous model of InAs/GaAs ring formation that assumes that the driving force for the dot to ring transformation is the difference in surface diffusion velocity of indium and gallium atoms.
13 pages, including 2 figures and 1 table. Submitted to Appl. Phys. Lett