Kim, Heedae Park, Seongho Okuyama, Rin Kyhm, Kwangseuk Eto, Mikio Taylor, Robert A. Nogues, Gilles Dang, Le Si Potemski, Marek Je, Koochul Kim, Jongsu Kyhm, Jihoon Song, Jindong 2024-01-19T21:33:53Z 2024-01-19T21:33:53Z 2021-09-05 2018-10 1530-6984 https://pubs.kist.re.kr/handle/201004/120843 We found that optical Aharonov-Bohm oscillations in a single GaAs/GaAIAs quantum ring can be controlled by excitation intensity. With a weak excitation intensity of 1.2 kW cm(-2), the optical Aharonov-Bohm oscillation period of biexcitons was observed to be half that of excitons in accordance with the period expected for a two-exciton Wigner molecule. When the excitation intensity is increased by an order of magnitude (12 kW cm(-2)), a gradual deviation of the Wigner molecule condition occurs with decreased oscillation periods and diamagnetic coefficients for both excitons and biexcitons along with a spectral shift. These results suggest that the effective orbit radii and rim widths of electrons and holes in a single quantum ring can be modified by light intensity via photoexcited carriers, which are possibly trapped at interface defects resulting in a local electric field. English AMER CHEMICAL SOC WIGNER MOLECULE DROPLET EPITAXY STATES SPECTROSCOPY DOTS Light Controlled Optical Aharonov-Bohm Oscillations in a Single Quantum Ring Article 10.1021/acs.nanolett.8b02131 1 NANO LETTERS, v.18, no.10, pp.6188 - 6194 NANO LETTERS 18 10 6188 6194 scie scopus 000447355400012 2-s2.0-85053887609 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article WIGNER MOLECULE DROPLET EPITAXY STATES SPECTROSCOPY DOTS Quantum rings excitons Aharonov-Bohm effect photoluminescence light excitation