Kinetic size selection mechanisms in heteroepitaxial quantum dot molecules.
Heteroepitaxial growth of Si(0.7)Ge(0.3)/Si(001) films under kinetically limited conditions leads to self-assembly of fourfold quantum dot molecules. These structures obtain a narrowly selected maximum size, independent of film thickness or annealing time. Size selection arises from efficient adatom trapping inside the central pit of the quantum dot molecule when the surrounding islands cojoin to form a continuous wall. Self-limiting growth of nanostructures has significant implications for novel nanoelectronic device architectures such as quantum cellular automata.
Gray
J L
JL
Department of Materials Science and Engineering, University of Virginia, Charlottesville, Virginia 22904-4745 USA.
Singh
N
N
Elzey
D M
DM
Hull
R
R
Floro
J A
JA