Kim, Heedae Song, Jin Dong 2024-01-19T23:33:32Z 2024-01-19T23:33:32Z 2021-09-03 2018-01-01 0169-4332 https://pubs.kist.re.kr/handle/201004/121827 We performed spectroscopy studies on a single GaAs laterally coupled quantum dot and an uncoupled quantum dot. Photoluminescence spectra confirmed the presence of optical coupling in the coupled quantum dot through dipole-dipole interactions. The optical coupling was investigated in terms of the integrated photoluminescence intensities and redshift of emission energies as the excitation power was increased. The excitation intensity was increased with linearly polarized light in the lateral coupling direction 1 (1) over bar0, which resulted in excitons X-1 and X-2 of the coupled quantum dot showing a clear photoluminescence peak shift to lower energy with drastically different power factors. These results were obtained by integrating the PL spectrum and comparing it to that of a single quantum dot. We also found that the decay rates of X-1 and X-2 in the coupled quantum dot increased significantly as a consequence of overlap of electron and hole wavefunctions extended via optical coupling in individual dots of the coupled quantum dot system. (C) 2017 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE BV DROPLET EPITAXY RING MOLECULES EXCITON STATES Optical studies on a single GaAs laterally coupled quantum dot in comparison with an uncoupled quantum dot Article 10.1016/j.apsusc.2017.08.231 1 APPLIED SURFACE SCIENCE, v.427, pp.405 - 409 APPLIED SURFACE SCIENCE 427 405 409 scie scopus 000415219100048 2-s2.0-85028987027 Chemistry, Physical Materials Science, Coatings & Films Physics, Applied Physics, Condensed Matter Chemistry Materials Science Physics Article DROPLET EPITAXY RING MOLECULES EXCITON STATES Laterally coupled quantum dot Uncoupled quantum dot Dipole-dipole interaction Optical coupling Time-resolved spectroscopy