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Title: Multiple virtual tunneling of dirac fermions in granular graphene
Authors: Pachoud, A.
Jaiswal, M. 
Wang, Y. 
Hong, B.-H.
Ahn, J.-H.
Loh, K.P. 
Özyilmaz, B.
Issue Date: 3-Dec-2013
Citation: Pachoud, A., Jaiswal, M., Wang, Y., Hong, B.-H., Ahn, J.-H., Loh, K.P., Özyilmaz, B. (2013-12-03). Multiple virtual tunneling of dirac fermions in granular graphene. Scientific Reports 3 : -. ScholarBank@NUS Repository.
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 10â€...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.
Source Title: Scientific Reports
ISSN: 20452322
DOI: 10.1038/srep03404
Appears in Collections:Staff Publications

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