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Multiple Virtual Tunneling of Dirac Fermions in Granular Graphene

Cited 4 time in Web of Science Cited 2 time in Scopus
Authors
Pachoud, Alexandre; Jaiswal, Manu; Wang, Yu; Hong, Byung Hee; Ahn, Jong-Hyun; Loh, Kian Ping; Oezyilmaz, Barbaros
Issue Date
2013-12
Citation
Scientific Reports, Vol.3, p. 3404
Abstract
Graphene charge carriers behave as massless Dirac fermions, opening the exciting possibility to observe long-range virtual tunneling of electrons in a solid. In granular metals, electron hops arising from series of virtual transitions are predicted to yield observable currents at low-enough temperatures, but to date experimental evidence is lacking. We report on electron transport in granular graphene films self-assembled by hydrogenation of suspended graphene. While the log-conductance shows a characteristic T-1/2 temperature dependence, cooling the samples below 10 K drives a triple crossover: a slope break in log-conductance, simultaneous to a substantial increase in magneto-conductance and onset of large mesoscopic conductance fluctuations. These phenomena are signatures of virtual transitions of electrons between distant localized states, and conductance statistics reveal that the high crossover-temperature is due to the Dirac nature of granular graphene charge carriers.
ISSN
2045-2322
URI
https://hdl.handle.net/10371/172276
DOI
https://doi.org/10.1038/srep03404
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College of Natural Sciences (자연과학대학)Dept. of Chemistry (화학부)Journal Papers (저널논문_화학부)
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