Journal
NANO LETTERS
Volume 18, Issue 10, Pages 6188-6194Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.8b02131
Keywords
Quantum rings; excitons; Aharonov-Bohm effect; photoluminescence; light excitation
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Funding
- Korean Grant [NRF-2017R1A2B4011594, 2013M3C1A3065522]
- JSPS KAKENHI [JP15H05870, JP26220711]
- Fundamental Research Funds for Central University of China
- EPSRC [EP/N01085X/1] Funding Source: UKRI
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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.
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