UNIGE document Scientific Article
previous document  unige:34930  next document
add to browser collection

High-Quality Multiterminal Suspended Graphene Devices

Published in Nano Letters. 2013, vol. 13, no. 11, p. 5165-5170
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 grapheneBallistic transportNegative resistanceGraphene bilayerQuantum Hall effect
Full text
Article (Published version) (2 MB) - document accessible for UNIGE members only Limited access to UNIGE
Research group Groupe Morpurgo
(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 https://archive-ouverte.unige.ch/unige:34930

458 hits



Deposited on : 2014-03-24

Export document
Format :
Citation style :