Multiple Virtual Tunneling of Dirac Fermions in Granular Graphene
- Pachoud, Alexandre; Jaiswal, Manu; Wang, Yu; Hong, Byung Hee; Ahn, Jong-Hyun; Loh, Kian Ping; Oezyilmaz, Barbaros
- Issue Date
- Scientific Reports, Vol.3, p. 3404
- 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.
- Files in This Item: There are no files associated with this item.