Light Controlled Optical Aharonov-Bohm Oscillations in a Single Quantum Ring

Heedae Kim, Seongho Park, Rin Okuyama, Kwangseuk Kyhm, Mikio Eto, Robert A. Taylor, Gilles Nogues, Le Si Dang, Marek Potemski, Koochul Je, Jongsu Kim, Jihoon Kyhm, Jindong Song

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Abstract

We found that optical Aharonov-Bohm oscillations in a single GaAs/GaAlAs 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.

Original languageEnglish
Pages (from-to)6188-6194
Number of pages7
JournalNano Letters
Volume18
Issue number10
DOIs
Publication statusPublished - 10 Oct 2018

Keywords

  • Aharonovâ'Bohm effect
  • Quantum rings
  • excitons
  • light excitation
  • photoluminescence

Cite this

Kim, H., Park, S., Okuyama, R., Kyhm, K., Eto, M., Taylor, R. A., Nogues, G., Dang, L. S., Potemski, M., Je, K., Kim, J., Kyhm, J., & Song, J. (2018). Light Controlled Optical Aharonov-Bohm Oscillations in a Single Quantum Ring. Nano Letters, 18(10), 6188-6194. https://doi.org/10.1021/acs.nanolett.8b02131