Semi-analytical approach to transport gaps in polycrystalline graphene
| Autor: | Jochen Rohrer, Delwin Perera |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Condensed matter physics Graphene Dirac (software) Phase (waves) 02 engineering and technology Electronic structure 021001 nanoscience & nanotechnology 01 natural sciences law.invention Brillouin zone law 0103 physical sciences General Materials Science Grain boundary Charge carrier Crystallite 010306 general physics 0210 nano-technology |
| Zdroj: | Nanoscale. 13:7709-7713 |
| ISSN: | 2040-3372 2040-3364 |
| Popis: | Electron transport in graphene is dominated by its Dirac-like charge carriers. Grain boundaries add a geometric aspect to the transport behavior by coupling differently oriented grains. In the phase coherent limit this aspect allows to relate the transport properties to two factors: the electronic structure of individual grains around the Dirac points and the orientation relation of the Dirac cones within the grain boundary Brillouin zone. Based on this picture it is possible to quantify the size and strain modulation of transport gaps without the need for explicit transport calculations within the non-equilibrium Green functions formalism. In this work we present a semi-analytical method that exploits this picture. Our method can explore arbitrary grain misorientations in the presence of an external strain providing valuable information about the electronic properties of individual grain boundaries. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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