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Electronic transport in helium-ion-beam etched encapsulated graphene nanoribbons

We report the etching of and electronic transport in nanoribbons of graphene sandwiched between atomically flat hexagonal boron nitride (h-BN). The etching of ribbons of varying width was achieved with a focused beam of 30 keV He+ ions. Using in-situ electrical measurements, we established a critica... Full description

Journal Title: Carbon 2017, Vol.119, pp.urn:issn:0008-6223
Main Author: Nanda, G.
Other Authors: Hlawacek, Gregor , Goswami, S. , Watanabe, Kenji , Taniguchi, Takashi , Alkemade, P.F.A.
Format: Electronic Article Electronic Article
Language: English
Subjects:
Quelle: NARCIS (National Academic Research and Collaborations Information System)
ID: ISSN: ; ISSN: 0008-6223
Zum Text:
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recordid: narcistud:oai:tudelft.nl:uuid:3674b3a3-5604-4b1f-907d-64c656b95bb0
title: Electronic transport in helium-ion-beam etched encapsulated graphene nanoribbons
format: Article
creator:
  • Nanda, G.
  • Hlawacek, Gregor
  • Goswami, S.
  • Watanabe, Kenji
  • Taniguchi, Takashi
  • Alkemade, P.F.A.
subjects:
  • Bandgap
  • Electronic Transport
  • Graphene
  • Graphene Nanoribbons
  • H-Bn
  • Helium Ion Microsope
ispartof: Carbon, 2017, Vol.119, pp.urn:issn:0008-6223
description: We report the etching of and electronic transport in nanoribbons of graphene sandwiched between atomically flat hexagonal boron nitride (h-BN). The etching of ribbons of varying width was achieved with a focused beam of 30 keV He+ ions. Using in-situ electrical measurements, we established a critical dose of 7000 ions nm−2 for creating a 10 nm wide insulating barrier between a nanoribbon and the rest of the encapsulated graphene. Subsequently, we measured the transport properties of the ion-beam etched graphene nanoribbons. Conductance measurements at 4 K show an energy gap, that increases with decreasing ribbon width. The narrowest ribbons show a weak dependence of the conductance on the Fermi energy. Furthermore, we observed power-law scaling in the measured current-voltage (I-V) curves, indicating that the conductance in the helium-ion-beam etched encapsulated graphene nanoribbons is governed by Coulomb blockade.
language: eng
source: NARCIS (National Academic Research and Collaborations Information System)
identifier: ISSN: ; ISSN: 0008-6223
fulltext: fulltext_linktorsrc
issn:
  • 0008-6223
url: Link


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titleElectronic transport in helium-ion-beam etched encapsulated graphene nanoribbons
creatorNanda, G. ; Hlawacek, Gregor ; Goswami, S. ; Watanabe, Kenji ; Taniguchi, Takashi ; Alkemade, P.F.A.
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subjectBandgap ; Electronic Transport ; Graphene ; Graphene Nanoribbons ; H-Bn ; Helium Ion Microsope
descriptionWe report the etching of and electronic transport in nanoribbons of graphene sandwiched between atomically flat hexagonal boron nitride (h-BN). The etching of ribbons of varying width was achieved with a focused beam of 30 keV He+ ions. Using in-situ electrical measurements, we established a critical dose of 7000 ions nm−2 for creating a 10 nm wide insulating barrier between a nanoribbon and the rest of the encapsulated graphene. Subsequently, we measured the transport properties of the ion-beam etched graphene nanoribbons. Conductance measurements at 4 K show an energy gap, that increases with decreasing ribbon width. The narrowest ribbons show a weak dependence of the conductance on the Fermi energy. Furthermore, we observed power-law scaling in the measured current-voltage (I-V) curves, indicating that the conductance in the helium-ion-beam etched encapsulated graphene nanoribbons is governed by Coulomb blockade.
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titleElectronic transport in helium-ion-beam etched encapsulated graphene nanoribbons
descriptionWe report the etching of and electronic transport in nanoribbons of graphene sandwiched between atomically flat hexagonal boron nitride (h-BN). The etching of ribbons of varying width was achieved with a focused beam of 30 keV He+ ions. Using in-situ electrical measurements, we established a critical dose of 7000 ions nm−2 for creating a 10 nm wide insulating barrier between a nanoribbon and the rest of the encapsulated graphene. Subsequently, we measured the transport properties of the ion-beam etched graphene nanoribbons. Conductance measurements at 4 K show an energy gap, that increases with decreasing ribbon width. The narrowest ribbons show a weak dependence of the conductance on the Fermi energy. Furthermore, we observed power-law scaling in the measured current-voltage (I-V) curves, indicating that the conductance in the helium-ion-beam etched encapsulated graphene nanoribbons is governed by Coulomb blockade.
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