Quantum Dots in Graphene Nanoribbons.
- Wang S Empa, Swiss Federal Laboratories for Materials Science and Technology , Überlandstrasse 129, CH-8600 Dübendorf, Switzerland.
- Kharche N Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute , Troy, 12180 New York, United States.
- Costa Girão E Departamento de Física, Universidade Federal do Piauí , CEP 64049-550, Teresina, Piauí Brazil.
- Feng X Department of Chemistry and Food Chemistry, Technische Universität Dresden , Mommsenstrasse 4, 01062 Dresden, Germany.
- Müllen K Max Planck Institute for Polymer Research , Ackermannweg 10, 55128 Mainz, Germany.
- Meunier V Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute , Troy, 12180 New York, United States.
- Fasel R Empa, Swiss Federal Laboratories for Materials Science and Technology , Überlandstrasse 129, CH-8600 Dübendorf, Switzerland.
- Ruffieux P Empa, Swiss Federal Laboratories for Materials Science and Technology , Überlandstrasse 129, CH-8600 Dübendorf, Switzerland.
- 2017-06-13
Published in:
- Nano letters. - 2017
Graphene quantum dot
density functional theory
graphene nanoribbon
scanning tunneling spectroscopy
screening
English
Graphene quantum dots (GQDs) hold great promise for applications in electronics, optoelectronics, and bioelectronics, but the fabrication of widely tunable GQDs has remained elusive. Here, we report the fabrication of atomically precise GQDs consisting of low-bandgap N = 14 armchair graphene nanoribbon (AGNR) segments that are achieved through edge fusion of N = 7 AGNRs. The so-formed intraribbon GQDs reveal deterministically defined, atomically sharp interfaces between wide and narrow AGNR segments and host a pair of low-lying interface states. Scanning tunneling microscopy/spectroscopy measurements complemented by extensive simulations reveal that their energy splitting depends exponentially on the length of the central narrow bandgap segment. This allows tuning of the fundamental gap of the GQDs over 1 order of magnitude within a few nanometers length range. These results are expected to pave the way for the development of widely tunable intraribbon GQD-based devices.
- Language
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- English
- Open access status
- green
- Identifiers
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- DOI 10.1021/acs.nanolett.7b01244
- PMID 28603996
- Persistent URL
- https://sonar.ch/global/documents/239768
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