Magneto-optical spectroscopy of single charge-tunable InAs/GaAs quantum dots emitting at telecom wavelengths

Sapienza, L., Al-Khuzheyri, R., Dada, A. , Griffiths, A., Clarke, E. and Gerardot, B. D. (2016) Magneto-optical spectroscopy of single charge-tunable InAs/GaAs quantum dots emitting at telecom wavelengths. Physical Review B, 93(15), 155301. (doi: 10.1103/PhysRevB.93.155301)

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We report on the optical properties of single InAs/GaAs quantum dots emitting near the telecommunication O-band, probed via Coulomb blockade and non-resonant photoluminescence spectroscopy, in the presence of external electric and magnetic fields. We extract the physical properties of the electron and hole wavefunctions, including the confinement energies, interaction energies, wavefunction lengths, and $g$-factors. For excitons, we measure the permanent dipole moment, polarizability, diamagnetic coefficient, and Zeeman splitting. The carriers are determined to be in the strong confinement regime. Large range electric field tunability, up to 7 meV, is demonstrated for excitons. We observe a large reduction, up to one order of magnitude, in the diamagnetic coefficient when rotating the magnetic field from Faraday to Voigt geometry due to the unique dot morphology. The complete spectroscopic characterization of the fundamental properties of long-wavelength dot-in-a-well structures provides insight for the applicability of quantum technologies based on quantum dots emitting at telecom wavelengths.

Item Type:Articles
Additional Information:This work was supported by a Royal Society University Research Fellowship, the EPSRC (Grants No. EP/I023186/1 and No. EP/K015338/1) and an ERC Starting Grant (No. 307392).
Glasgow Author(s) Enlighten ID:Sapienza, Dr Luca and Dada, Dr Adetunmise
Authors: Sapienza, L., Al-Khuzheyri, R., Dada, A., Griffiths, A., Clarke, E., and Gerardot, B. D.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Physical Review B
Publisher:American Physical Society
ISSN (Online):1550-235X
Published Online:01 April 2016
Copyright Holders:Copyright © 2016 American Physical Society
First Published:First published in Physical Review B 93(15): 155301
Publisher Policy:Reproduced under a Creative Commons License

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