Spin-Orbit Effects on the Dynamical Properties of Polarons in Graphene Nanoribbons
| Autor: | Wiliam Ferreira da Cunha, Luiz Antonio Ribeiro, Gesiel Gomes Silva, Rafael Timóteo de Sousa Júnior, Antonio Luciano de Almeida Fonseca, Geraldo Magela e Silva |
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| Rok vydání: | 2018 |
| Předmět: |
Physics
Coupling Multidisciplinary Other Physics Topics Condensed matter physics lcsh:R lcsh:Medicine Saturation velocity Annan fysik Charge (physics) 02 engineering and technology 021001 nanoscience & nanotechnology Polaron 01 natural sciences Article 0103 physical sciences Orbit (dynamics) lcsh:Q Charge carrier lcsh:Science 010306 general physics 0210 nano-technology Spin (physics) Graphene nanoribbons |
| Zdroj: | Scientific Reports Scientific Reports, Vol 8, Iss 1, Pp 1-8 (2018) |
| ISSN: | 2045-2322 |
| DOI: | 10.1038/s41598-018-19893-y |
| Popis: | The dynamical properties of polarons in armchair graphene nanoribbons (GNR) is numerically investigated in the framework of a two-dimensional tight-binding model that considers spin-orbit (SO) coupling and electron-lattice (e-l) interactions. Within this physical picture, novel polaron properties with no counterparts to results obtained from conventional tight-binding models are obtained. Our findings show that, depending on the systems width, the presence of SO coupling changes the polarons charge localization giving rise to different degrees of stability for the charge carrier. For instance, the joint action of SO coupling and e-l interactions could promote a slight increase on the charge concentration in the center of the lattice deformation associated to the polaron. As a straightforward consequence, this process of increasing stability would lead to a depreciation in the polarons motion by decreasing its saturation velocity. Our finds are in good agreement with recent experimental investigations for the charge localization in GNR, mostly when it comes to the influence of SO coupling. Moreover, the contributions reported here provide a reliable method for future works to evaluate spin-orbit influence on the performance of graphene nanoribbons. Funding Agencies|CNPq; CAPES; FAP-DF; FINATEC; Brazilian Ministry of Planning, Development and Management [005/2016 DIPLA, 11/2016 SEST]; DPGU - Brazilian Union Public Defender [066/2016]; FAP-DF [0193.000.942/2015, 0193.001343/2016]; IFG |
| Databáze: | OpenAIRE |
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