Observation of a Biexciton Wigner Molecule by Fractional Optical Aharonov-Bohm Oscillations in a Single Quantum Ring

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• 作者：Hee Dae Kim ; Rin Okuyama ; Kwangseuk Kyhm ; Mikio Eto ; Robert A. Taylor ; Aurelien L. Nicolet ; Marek Potemski ; Gilles Nogues ; Le Si Dang ; Ku-Chul Je ; Jongsu Kim ; Ji-Hoon Kyhm ; Kyu Hyoek Yoen ; Eun Hye Lee ; Jun Young Kim ; Il Ki Han ; Wonjun Choi ; Jindong Song
• 刊名：Nano Letters
• 出版年：2016
• 出版时间：January 13, 2016
• 年：2016
• 卷：16
• 期：1
• 页码：27-33
• 全文大小：546K
• ISSN：1530-6992

文摘

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.