title: Observation of a Biexciton Wigner Molecule by Fractional Optical Aharonov-Bohm Oscillations in a Single Quantum Ring.
abstract: 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.
authors.affiliation: Clarendon Laboratory, Department of Physics, University of Oxford , Oxford, OX1 3PU, United Kingdom.
authors.forename: Hee Dae
authors.initials: HD
authors.lastname: Kim
authors.affiliation: Faculty of Science and Technology, Keio University , 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan.
authors.forename: Rin
authors.initials: R
authors.lastname: Okuyama
authors.affiliation: Department of NANOscience, Institut Néel, CNRS , rue des Martyrs 38054, Grenoble, France.
authors.forename: Kwangseuk
authors.initials: K
authors.lastname: Kyhm
authors.affiliation: Faculty of Science and Technology, Keio University , 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan.
authors.forename: Mikio
authors.initials: M
authors.lastname: Eto
authors.affiliation: Clarendon Laboratory, Department of Physics, University of Oxford , Oxford, OX1 3PU, United Kingdom.
authors.forename: Robert A
authors.initials: RA
authors.lastname: Taylor
authors.affiliation: Laboratoire National des Champs Magnetiques Intenses, CNRS-UJF-UPS-INSA , F-38042, Grenoble, France.
authors.forename: Aurelien L
authors.initials: AL
authors.lastname: Nicolet
authors.affiliation: Laboratoire National des Champs Magnetiques Intenses, CNRS-UJF-UPS-INSA , F-38042, Grenoble, France.
authors.forename: Marek
authors.initials: M
authors.lastname: Potemski
authors.affiliation: Department of NANOscience, Institut Néel, CNRS , rue des Martyrs 38054, Grenoble, France.
authors.forename: Gilles
authors.initials: G
authors.lastname: Nogues
authors.affiliation: Department of NANOscience, Institut Néel, CNRS , rue des Martyrs 38054, Grenoble, France.
authors.forename: Le Si
authors.initials: le S
authors.lastname: Dang
authors.affiliation: College of Liberal Arts and Sciences, Anyang University , Gyeonggi-do 430-714, South Korea.
authors.forename: Ku-Chul
authors.initials: KC
authors.lastname: Je
authors.affiliation: Department of Physics, Yeungnam University , Gyeonsan 712-749, South Korea.
authors.forename: Jongsu
authors.initials: J
authors.lastname: Kim
authors.affiliation: Center for Optoelectronic Convergence Systems, KIST , Seoul, 136-791, South Korea.
authors.forename: Ji-Hoon
authors.initials: JH
authors.lastname: Kyhm
authors.affiliation: Center for Optoelectronic Convergence Systems, KIST , Seoul, 136-791, South Korea.
authors.forename: Kyu Hyoek
authors.initials: KH
authors.lastname: Yoen
authors.affiliation: Center for Optoelectronic Convergence Systems, KIST , Seoul, 136-791, South Korea.
authors.forename: Eun Hye
authors.initials: EH
authors.lastname: Lee
authors.affiliation: Center for Optoelectronic Convergence Systems, KIST , Seoul, 136-791, South Korea.
authors.forename: Jun Young
authors.initials: JY
authors.lastname: Kim
authors.affiliation: Center for Optoelectronic Convergence Systems, KIST , Seoul, 136-791, South Korea.
authors.forename: Il Ki
authors.initials: IK
authors.lastname: Han
authors.affiliation: Center for Optoelectronic Convergence Systems, KIST , Seoul, 136-791, South Korea.
authors.forename: Wonjun
authors.initials: W
authors.lastname: Choi
authors.affiliation: Center for Optoelectronic Convergence Systems, KIST , Seoul, 136-791, South Korea.
authors.forename: Jindong
authors.initials: J
authors.lastname: Song
keywords: Optical Aharonov-Bohm effect; Wigner molecule; biexciton; disorder effect; exciton; quantum ring