Tuning the g-factor of neutral and charged excitons confined to self-assembled (Al,Ga)As shell quantum dots

Journal Article · Mon Dec 01 00:00:00 EST 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4903515· OSTI ID:22402427

Van Hattem, B.; Phillips, R. T. ^[1]; Fontana, Y.; Russo-Averchi, E.; Heiss, M.; Fontcuberta i Morral, A. ^[2]

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1. Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE (United Kingdom)
2. Laboratoire des Matériaux Semiconducteurs, Institut des Matériaux, École Polytechnique Fédérale de Lausanne, 1015 Lausanne (Switzerland)

We study the neutral exciton (X) and charged exciton (CX) transitions from (Al,Ga)As shell quantum dots located in core-shell nanowires, in the presence of a magnetic field. The g-factors and the diamagnetic coefficients of both the X and the CX depend on the orientation of the field with respect to the nanowire axis. The aspect ratio of the X wavefunction is quantified based on the anisotropy of the diamagnetic coefficient. For specific orientations of the magnetic field, it is possible to cancel the g-factor of the bright states of the X and the CX by means of an inversion of the sign of the hole's g-factor, which is promising for quantum information processing applications.

• OSTI ID: 22402427
• Journal Information: Applied Physics Letters, Vol. 105, Issue 22; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALUMINIUM ARSENIDES
ANISOTROPY
ASPECT RATIO
EXCITONS
GALLIUM ARSENIDES
LANDE FACTOR
MAGNETIC FIELDS
NANOWIRES
QUANTUM DOTS
QUANTUM INFORMATION
WAVE FUNCTIONS