Precise engineering of quantum dot array coupling through their barrier widths

Piquero-Zulaica, Ignacio and Lobo-Checa, Jorge and Sadeghi, Ali and Abd El-Fattah, Zakaria M. and Mitsui, Chikahiko and Okamoto, Toshihiro and Pawlak, Remy and Meier, Tobias and Arnau, Andres and Ortega, J. Enrique and Takeya, Jun and Goedecker, Stefan and Meyer, Ernst and Kawai, Shigeki. (2017) Precise engineering of quantum dot array coupling through their barrier widths. Nature Communications, 8. p. 787.

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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.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Physik (Goedecker)
UniBasel Contributors:Goedecker, Stefan
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Nature Publishing Group
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:15 Jan 2018 15:25
Deposited On:15 Jan 2018 15:25

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