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

Magneto-optical spectroscopy of single charge-tunable InAs/GaAs quantum dots emitting at telecom wavelengths
Magneto-optical spectroscopy of single charge-tunable InAs/GaAs quantum dots emitting at telecom wavelengths
We report on the optical properties of single InAs/GaAs quantum dots emitting near the telecommunication O band, probed via Coulomb blockade and nonresonant photoluminescence spectroscopy, in the presence of external electric and magnetic fields. We extract the physical properties of the electron and hole wave functions, including the confinement energies, interaction energies, wave-function 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.
1550-235X
1-6
Sapienza, Luca
a2e0cf6c-1f22-4a5a-87a2-ffab0e24e6ac
Al-Khuzheyri, Rima
f5250a3e-be2b-42b9-b610-e54cee8b50e4
Dada, Adetunmise
59df6fc9-3ea0-4381-9be9-7834f0e77922
Griffiths, Andrew
87e80de2-ea7a-4ca4-baea-da5135182a86
Clarke, Edmund
cae7355d-ba0a-4a5f-afc5-f5135863c6f5
Gerardot, Brian D.
14887442-0e00-41a3-a82e-1f912e2a93ab
Sapienza, Luca
a2e0cf6c-1f22-4a5a-87a2-ffab0e24e6ac
Al-Khuzheyri, Rima
f5250a3e-be2b-42b9-b610-e54cee8b50e4
Dada, Adetunmise
59df6fc9-3ea0-4381-9be9-7834f0e77922
Griffiths, Andrew
87e80de2-ea7a-4ca4-baea-da5135182a86
Clarke, Edmund
cae7355d-ba0a-4a5f-afc5-f5135863c6f5
Gerardot, Brian D.
14887442-0e00-41a3-a82e-1f912e2a93ab

Sapienza, Luca, Al-Khuzheyri, Rima, Dada, Adetunmise, Griffiths, Andrew, Clarke, Edmund and Gerardot, Brian D. (2016) Magneto-optical spectroscopy of single charge-tunable InAs/GaAs quantum dots emitting at telecom wavelengths. Physical Review B, 93 (155301), 1-6. (doi:10.1103/PhysRevB.93.155301).

Record type: Article

Abstract

We report on the optical properties of single InAs/GaAs quantum dots emitting near the telecommunication O band, probed via Coulomb blockade and nonresonant photoluminescence spectroscopy, in the presence of external electric and magnetic fields. We extract the physical properties of the electron and hole wave functions, including the confinement energies, interaction energies, wave-function 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.

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More information

Accepted/In Press date: 8 March 2016
e-pub ahead of print date: 1 April 2016
Organisations: Quantum, Light & Matter Group

Identifiers

Local EPrints ID: 395579
URI: http://eprints.soton.ac.uk/id/eprint/395579
ISSN: 1550-235X
PURE UUID: 013256c4-7d9b-430e-83de-a795d0ab5502

Catalogue record

Date deposited: 27 May 2016 15:43
Last modified: 21 Nov 2021 01:52

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Contributors

Author: Luca Sapienza
Author: Rima Al-Khuzheyri
Author: Adetunmise Dada
Author: Andrew Griffiths
Author: Edmund Clarke
Author: Brian D. Gerardot

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