2026-06-24T09:13:01Z https://archive.materialscloud.org/oai2d

oai:materialscloud.org:657 2020-12-04T11:51:09Z openaire_data community-mcarchive

Pizzochero, Michele Čerņevičs, Kristiāns Yazyev, Oleg V. Pizzochero, Michele 2020-12-04 The success of all-graphene electronics is severely hindered by the challenging realization and subsequent integration of semiconducting channels and metallic contacts. Here, we comprehensively investigate the electronic transport across width-modulated heterojunctions consisting of a graphene quantum dot of varying lengths and widths embedded in a pair of armchair-edged metallic nanoribbons, of the kind recently fabricated via on-surface synthesis. We show that the presence of the quantum dot enables the opening of a width-dependent transport gap, thereby yielding built-in one-dimensional metal-semiconductor-metal junctions. Furthermore, we find that, in the vicinity of the band edges, the conductance is subject to a smooth transition from an antiresonant to a resonant transport regime upon increasing the channel length. These results are rationalized in terms of a competition between quantum-confinement effects and quantum dot-to-lead coupling. Overall, our work establishes graphene quantum dot nanoarchitectures as appealing platforms to seamlessly integrate gap-tunable semiconducting channels and metallic contacts into an individual nanoribbon, hence realizing self-contained carbon-based electronic devices. application/zip text/plain text/markdown https://doi.org/10.24435/materialscloud:cd-gr oai:materialscloud.org:657 mcid:2020.159 eng Materials Cloud https://doi.org/10.1103/PhysRevB.102.201406 https://archive.materialscloud.org/communities/mcarchive https://doi.org/10.24435/materialscloud:3p-zn info:eu-repo/semantics/openAccess Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode GNR Graphene Nanoribbon Quantum dot Electronic transport SNSF MARVEL CSCS Electronic transport across quantum dots in graphene nanoribbons: Toward built-in gap-tunable metal-semiconductor-metal heterojunctions info:eu-repo/semantics/other