Scientific article
English

High-Quality Multiterminal Suspended Graphene Devices

Published inNano letters, vol. 13, no. 11, p. 5165-5170
Publication date2013
Abstract

We introduce a new scheme to realize suspended, multiterminal graphene structures that can be current annealed successfully to obtain uniform, very high quality devices. A key aspect is that the bulky metallic contacts are not connected directly to the part of graphene probed by transport measurements, but only through etched constriction, which prevents the contacts from acting invasively. The device high quality and uniformity is demonstrated by a reproducibly narrow (δn 109 cm–2) resistance peak around charge neutrality, by carrier mobility values exceeding 106 cm2 V–1 s–1, by the observation of integer quantum Hall plateaus starting at 30 mT and of symmetry broken states at about 200 mT, and by the occurrence of a negative multiterminal resistance directly proving the occurrence of ballistic transport. As these multiterminal devices enable measurements that cannot be done in a simpler two-terminal configuration, we anticipate that their use in future studies of graphene-based systems will be particularly relevant.

Keywords
  • Multiterminal suspended graphene
  • Ballistic transport
  • Negative resistance
  • Graphene bilayer
  • Quantum Hall effect
Research groups
Citation (ISO format)
KI, Dongkeun, MORPURGO, Alberto. High-Quality Multiterminal Suspended Graphene Devices. In: Nano letters, 2013, vol. 13, n° 11, p. 5165–5170. doi: 10.1021/nl402462q
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Article (Published version)
accessLevelRestricted
Identifiers
Journal ISSN1530-6984
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