Graphene mediated Stark shifting of quantum dot energy levels

Kinnischtzke, L., Goodfellow, K. M., Chakraborty, C., Lai, Y.-M., Fält, S., Wegscheider, W., Badolato, A. and Vamivakas, A. N. (2016) Graphene mediated Stark shifting of quantum dot energy levels. Applied Physics Letters, 108(21), 211905. (doi: 10.1063/1.4952611)

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Abstract

We demonstrate an optoelectronic device comprised of single InAs quantum dots in an n-i-Schottky diode where graphene has been used as the Schottky contact. Deterministic electric field tuning is shown using Stark-shifted micro-photoluminescence from single quantum dots. The extracted dipole moments from the Stark shifts are comparable to conventional devices where the Schottky contact is a semi-transparent metal. Neutral and singly charged excitons are also observed in the well-known Coulomb-blockade plateaus. Our results indicate that graphene is a suitable replacement for metal contacts in quantum dot devices which require electric field control.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Badolato, Professor Antonio
Authors: Kinnischtzke, L., Goodfellow, K. M., Chakraborty, C., Lai, Y.-M., Fält, S., Wegscheider, W., Badolato, A., and Vamivakas, A. N.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Applied Physics Letters
Publisher:AIP Publishing
ISSN:0003-6951
ISSN (Online):1077-3118
Published Online:25 May 2016

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