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Semi-analytical approach to transport gaps in polycrystalline graphene

Perera, Delwin ; Rohrer, Jochen (2021)
Semi-analytical approach to transport gaps in polycrystalline graphene.
In: Nanoscale, 13 (16)
doi: 10.1039/d1nr00186h
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

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.

Typ des Eintrags: Artikel
Erschienen: 2021
Autor(en): Perera, Delwin ; Rohrer, Jochen
Art des Eintrags: Bibliographie
Titel: Semi-analytical approach to transport gaps in polycrystalline graphene
Sprache: Englisch
Publikationsjahr: 16 April 2021
Verlag: Royal Society of Chemistry
Titel der Zeitschrift, Zeitung oder Schriftenreihe: Nanoscale
Jahrgang/Volume einer Zeitschrift: 13
(Heft-)Nummer: 16
DOI: 10.1039/d1nr00186h
Kurzbeschreibung (Abstract):

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.

Fachbereich(e)/-gebiet(e): 11 Fachbereich Material- und Geowissenschaften
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Materialmodellierung
Zentrale Einrichtungen
Zentrale Einrichtungen > Hochschulrechenzentrum (HRZ)
Zentrale Einrichtungen > Hochschulrechenzentrum (HRZ) > Hochleistungsrechner
TU-Projekte: DFG|RO4542/3-1|Piezoresistivität in
Hinterlegungsdatum: 04 Mai 2021 14:10
Letzte Änderung: 04 Mai 2021 14:10
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