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Bipolaron Dynamics in Graphene Nanoribbons
Goias Fed Inst Educ Sci and Technol, Brazil.
Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, Faculty of Science & Engineering. Univ Brasilia, Brazil; Univ Brasilia, Brazil.ORCID iD: 0000-0001-7468-2946
Univ Brasilia, Brazil.
Univ Brasilia, Brazil; Univ Brasilia, Brazil.
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2019 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 9, article id 2909Article in journal (Refereed) Published
Abstract [en]

Graphene nanoribbons (GNRs) are two-dimensional structures with a rich variety of electronic properties that derive from their semiconducting band gaps. In these materials, charge transport can occur via a hopping process mediated by carriers formed by self-interacting states between the excess charge and local lattice deformations. Here, we use a two-dimensional tight-binding approach to reveal the formation of bipolarons in GNRs. Our results show that the formed bipolarons are dynamically stable even for high electric field strengths when it comes to GNRs. Remarkably, the bipolaron dynamics can occur in acoustic and optical regimes concerning its saturation velocity. The phase transition between these two regimes takes place for a critical field strength in which the bipolaron moves roughly with the speed of sound in the material.

Place, publisher, year, edition, pages
NATURE PUBLISHING GROUP , 2019. Vol. 9, article id 2909
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-155570DOI: 10.1038/s41598-019-39774-2ISI: 000459799800058PubMedID: 30814607OAI: oai:DiVA.org:liu-155570DiVA, id: diva2:1299375
Note

Funding Agencies|CNPq; CAPES; FAP-DF; CENAPAD-SP; Brazilian Ministry of Planning, Development and Management [005/2016, 11/2016]; DPGU - Brazilian Union Public Defender [066/2016]; FAP-DF grants [0193.001.511/2017, 0193.001343/2016, 0193.001766/2017]

Available from: 2019-03-26 Created: 2019-03-26 Last updated: 2019-09-24

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CiteExportLink to record
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Citation style
  • apa
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