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|Title:||Multiple virtual tunneling of dirac fermions in granular graphene|
|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|
|Appears in Collections:||Staff Publications|
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