Kim, Heedae Kim, Inhong Kyhm, Kwangseuk Taylor, Robert A. Kim, Jong Su Song, Jin Dong Je, Koo Chul Dang, Le Si 2024-01-20T02:34:27Z 2024-01-20T02:34:27Z 2021-09-05 2016-12 1530-6984 https://pubs.kist.re.kr/handle/201004/123362 We find that the exciton dipole dipole interaction in a single laterally coupled GaAs/AlGaAs quantum dot structure can be controlled by the linear polarization of a nonresonant optical excitation. When the excitation intensity is increased with the linearly polarized light parallel to the lateral coupling direction [1 (1) over bar0], excitons (X-1 and X-2) and local biexcitons (X1X1 and X2X2) of the two separate quantum dots (QD(1) and QD(2)) show a redshift along with coupled biexcitons (X1X2), while neither coupled biexcitons nor a redshift are observed when the polarization of the exciting beam is perpendicular to the coupling direction. The polarization dependence and the redshift are attributed to an optical nonlinearity in the exciton Forster resonant energy transfer interaction, whereby exciton population transfer between the two quantum dots also becomes significant with increasing excitation intensity. We have further distinguished coupled biexcitons from local biexcitons by their large diamagnetic coefficient. English AMER CHEMICAL SOC ENERGY-TRANSFER MOLECULES DYNAMICS Exciton Dipole-Dipole Interaction in a Single Coupled-Quantum-Dot Structure via Polarized Excitation Article 10.1021/acs.nanolett.6b03868 1 NANO LETTERS, v.16, no.12, pp.7755 - 7760 NANO LETTERS 16 12 7755 7760 scie scopus 000389963200065 2-s2.0-85006511425 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article ENERGY-TRANSFER MOLECULES DYNAMICS Laterally coupled quantum dot structures dipole-dipole interaction FRET coupled biexcitons