A Mechanically Tunable Quantum Dot in a Graphene Break Junction
| Autor: | Matthijs D. Hermans, Kenji Watanabe, Sabina Caneva, Martin Lee, Takashi Taniguchi, Amador García-Fuente, Herre S. J. van der Zant, Pascal Gehring, Jaime Ferrer, Cees Dekker |
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| Přispěvatelé: | UCL - SST/IMCN/NAPS - Nanoscopic Physics, Ministry of Education, Culture, Sports, Science and Technology (Japan), Agencia Estatal de Investigación (España), Ministerio de Ciencia, Innovación y Universidades (España), European Commission, European Research Council |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Letter Orders of magnitude (temperature) tunnel coupling FOS: Physical sciences Physics::Optics Bioengineering 02 engineering and technology law.invention law Mesoscale and Nanoscale Physics (cond-mat.mes-hall) General Materials Science mechanical break junction Quantum Coupling Coupling constant Condensed Matter - Mesoscale and Nanoscale Physics business.industry Graphene Mechanical Engineering graphene Coulomb blockade General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Condensed Matter::Mesoscopic Systems and Quantum Hall Effect quantum dot (QD) Quantum dot Optoelectronics 0210 nano-technology business Break junction |
| Zdroj: | Nano Letters Nano Letters: a journal dedicated to nanoscience and nanotechnology, 20(7) Scopus RUO. Repositorio Institucional de la Universidad de Oviedo Universidad de las Islas Baleares RUO: Repositorio Institucional de la Universidad de Oviedo Universidad de Oviedo (UNIOVI) Nano Letters : a journal dedicated to nanoscience and nanotechnology, Vol. 20, no.np, p. 4924-4931 (2020) Digital.CSIC. Repositorio Institucional del CSIC instname |
| ISSN: | 1530-6992 1530-6984 |
| Popis: | Graphene quantum dots (QDs) are intensively studied as platforms for the next generation of quantum electronic devices. Fine tuning of the transport properties in monolayer graphene QDs, in particular with respect to the independent modulation of the tunnel barrier transparencies, remains challenging and is typically addressed using electrostatic gating. We investigate charge transport in back-gated graphene mechanical break junctions and reveal Coulomb blockade physics characteristic of a single, high-quality QD when a nanogap is opened in a graphene constriction. By mechanically controlling the distance across the newly formed graphene nanogap, we achieve reversible tunability of the tunnel coupling to the drain electrode by 5 orders of magnitude, while keeping the source-QD tunnel coupling constant. The break junction device can therefore become a powerful platform to study the physical parameters that are crucial to the development of future graphene-based devices, including energy converters and quantum calorimeters. S.C. acknowledges a Marie Skłodowska-Curie Individual Fellowship under grant BioGraphING (ID: 798851) and P.G. acknowledges a Marie Skłodowska-Curie Individual Fellowship under grant TherSpinMol (ID: 748642) from the European Union’s Horizon 2020 research and innovation programme. K.W. and T.T. acknowledge support from the Elemental Strategy Initiative conducted by the MEXT, Japan, and the CREST (JPMJCR15F3), JST. This work was supported by the Graphene Flagship (a European Union’s Horizon 2020 research and innovation programme under grant agreement no. 649953), the Marie Curie ITN MOLESCO, an ERC advanced grant (Mols@Mols no. 240299), and a Spanish MCIU/AEI/FEDER project (PGC2018-094783). |
| Databáze: | OpenAIRE |
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