Please use this identifier to cite or link to this item: https://doi.org/10.1038/srep03404
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
Source: 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. https://doi.org/10.1038/srep03404
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
URI: http://scholarbank.nus.edu.sg/handle/10635/64265
ISSN: 20452322
DOI: 10.1038/srep03404
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

Page view(s)

36
checked on Dec 7, 2017

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.