Observation of a Biexciton Wigner Molecule by Fractional Optical Aharonov-Bohm Oscillations in a Single Quantum Ring
journal contributionposted on 13.01.2016, 00:00 by 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
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.