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

Research output: Contribution to journalArticle

3 Citations (Scopus)

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 - 2018 Oct 10

Fingerprint

Excitons
excitons
oscillations
rings
excitation
Molecules
rims
luminous intensity
molecules
Orbits
Electric fields
orbits
deviation
Defects
radii
electric fields
Electrons
shift
defects
coefficients

Keywords

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

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

Kim, H., Park, S., Okuyama, R., Kyhm, K., Eto, M., Taylor, R. A., ... 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

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

In: Nano Letters, Vol. 18, No. 10, 10.10.2018, p. 6188-6194.

Research output: Contribution to journalArticle

Kim, H, Park, S, Okuyama, R, Kyhm, K, Eto, M, Taylor, RA, Nogues, G, Dang, LS, Potemski, M, Je, K, Kim, J, Kyhm, J & Song, J 2018, 'Light Controlled Optical Aharonov-Bohm Oscillations in a Single Quantum Ring', Nano Letters, vol. 18, no. 10, pp. 6188-6194. https://doi.org/10.1021/acs.nanolett.8b02131
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. / Light Controlled Optical Aharonov-Bohm Oscillations in a Single Quantum Ring. In: Nano Letters. 2018 ; Vol. 18, No. 10. pp. 6188-6194.
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