Journal
NANO LETTERS
Volume 16, Issue 1, Pages 27-33Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b02419
Keywords
Optical Aharonov-Bohm effect; quantum ring; exciton; biexciton; Wigner molecule; disorder effect
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Funding
- European Commission from seventh framework programme Transnational Access-EuroMagNet II-Integrated Activities, Korean Grant (GEL program) [228043, NRF-2014R1A1A2058789]
- French-Korean LIA
- EPSRC [EP/K014978/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/K014978/1] Funding Source: researchfish
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The Aharonov-Bohm effect in ring structures in the presence of electronic correlation and disorder is an open issue. We report novel oscillations of a strongly correlated exciton pair, similar to a Wigner molecule, in a single nanoquantum ring, where the emission energy changes abruptly at the transition magnetic field with a fractional oscillation period compared to that of the exciton, a so-called fractional optical Aharonov-Bohm oscillation. We have also observed modulated optical Aharonov-Bohm oscillations of an electron-hole pair and an anticrossing of the photoluminescence spectrum at the transition magnetic field, which are associated with disorder effects such as localization, built-in electric field, and impurities.
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