Precise engineering of quantum dot array coupling through their barrier widths

Ignacio Piquero-Zulaica, Jorge Lobo-Checa (), Ali Sadeghi, Zakaria M. Abd El-Fattah, Chikahiko Mitsui, Toshihiro Okamoto (), Rémy Pawlak, Tobias Meier, Andrés Arnau, J. Enrique Ortega, Jun Takeya, Stefan Goedecker, Ernst Meyer and Shigeki Kawai ()
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Ignacio Piquero-Zulaica: Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center
Jorge Lobo-Checa: CSIC-Universidad de Zaragoza
Ali Sadeghi: Shahid Beheshti University
Zakaria M. Abd El-Fattah: Al-Azhar University
Chikahiko Mitsui: The University of Tokyo
Toshihiro Okamoto: The University of Tokyo
Rémy Pawlak: University of Basel
Tobias Meier: University of Basel
Andrés Arnau: Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center
J. Enrique Ortega: Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center
Jun Takeya: The University of Tokyo
Stefan Goedecker: University of Basel
Ernst Meyer: University of Basel
Shigeki Kawai: PRESTO, Japan Science and Technology Agency

Nature Communications, 2017, vol. 8, issue 1, 1-6

Abstract: Abstract Quantum dots are known to confine electrons within their structure. Whenever they periodically aggregate into arrays and cooperative interactions arise, novel quantum properties suitable for technological applications show up. Control over the potential barriers existing between neighboring quantum dots is therefore essential to alter their mutual crosstalk. Here we show that precise engineering of the barrier width can be experimentally achieved on surfaces by a single atom substitution in a haloaromatic compound, which in turn tunes the confinement properties through the degree of quantum dot intercoupling. We achieved this by generating self-assembled molecular nanoporous networks that confine the two-dimensional electron gas present at the surface. Indeed, these extended arrays form up on bulk surface and thin silver films alike, maintaining their overall interdot coupling. These findings pave the way to reach full control over two-dimensional electron gases by means of self-assembled molecular networks.

Date: 2017
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DOI: 10.1038/s41467-017-00872-2

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