TY - JOUR
T1 - Interlayer correlation of embedded quantum-dot arrays through their surface strain energy distributions
AU - Pan, Ernie
AU - Zou, Yu
AU - Chung, Peter W.
AU - Zhang, Yan
PY - 2009/8/17
Y1 - 2009/8/17
N2 - We propose an interlayer correlation of multilayer quantum-dot (QD) distributions from a rigorous strain energy calculation. This leads to a map of correlations, or interlayer alignment, based solely on lateral and vertical spacing (xdist/b versus hdist/h). We identify four distinct correlation regimes-aligned correlation, antialigned correlation, noncorrelation, and the transition zone between the aligned and antialigned correlation. Our prediction matches well with available experimental data for a broad range of semiconductors with low elastic anisotropy [A=2 C44 / (C11 - C12) <2] and can further predict the QD array distribution for those with high elastic anisotropy (A 2) by a simple shift in hdist/h. The agreement spans both IV-VI and III-V systems. Moreover, the aligned correlation regime produces a large decay in strain energy magnitudes in subsequently grown layers, which may contribute to their observed larger nucleation domains.
AB - We propose an interlayer correlation of multilayer quantum-dot (QD) distributions from a rigorous strain energy calculation. This leads to a map of correlations, or interlayer alignment, based solely on lateral and vertical spacing (xdist/b versus hdist/h). We identify four distinct correlation regimes-aligned correlation, antialigned correlation, noncorrelation, and the transition zone between the aligned and antialigned correlation. Our prediction matches well with available experimental data for a broad range of semiconductors with low elastic anisotropy [A=2 C44 / (C11 - C12) <2] and can further predict the QD array distribution for those with high elastic anisotropy (A 2) by a simple shift in hdist/h. The agreement spans both IV-VI and III-V systems. Moreover, the aligned correlation regime produces a large decay in strain energy magnitudes in subsequently grown layers, which may contribute to their observed larger nucleation domains.
UR - http://www.scopus.com/inward/record.url?scp=70249133654&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.80.073302
DO - 10.1103/PhysRevB.80.073302
M3 - Article
AN - SCOPUS:70249133654
SN - 1098-0121
VL - 80
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 7
M1 - 073302
ER -