Multiple virtual tunneling of dirac fermions in granular graphene

Alexandre Pachoud, Manu Jaiswal, Yu Wang, Byung Hee Hong, Jong Hyun Ahn, Kian Ping Loh, Barbaros Özyilmaz

Research output: Contribution to journalArticle

2 Citations (Scopus)

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.

Original languageEnglish
Article number3404
JournalScientific reports
Volume3
DOIs
Publication statusPublished - 2013 Dec 3

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graphene
fermions
charge carriers
crossovers
electrons
hydrogenation
signatures
statistics
slopes
cooling
temperature dependence
metals
temperature

All Science Journal Classification (ASJC) codes

  • General

Cite this

Pachoud, A., Jaiswal, M., Wang, Y., Hong, B. H., Ahn, J. H., Loh, K. P., & Özyilmaz, B. (2013). Multiple virtual tunneling of dirac fermions in granular graphene. Scientific reports, 3, [3404]. https://doi.org/10.1038/srep03404
Pachoud, Alexandre ; Jaiswal, Manu ; Wang, Yu ; Hong, Byung Hee ; Ahn, Jong Hyun ; Loh, Kian Ping ; Özyilmaz, Barbaros. / Multiple virtual tunneling of dirac fermions in granular graphene. In: Scientific reports. 2013 ; Vol. 3.
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Pachoud, A, Jaiswal, M, Wang, Y, Hong, BH, Ahn, JH, Loh, KP & Özyilmaz, B 2013, 'Multiple virtual tunneling of dirac fermions in granular graphene', Scientific reports, vol. 3, 3404. https://doi.org/10.1038/srep03404

Multiple virtual tunneling of dirac fermions in granular graphene. / Pachoud, Alexandre; Jaiswal, Manu; Wang, Yu; Hong, Byung Hee; Ahn, Jong Hyun; Loh, Kian Ping; Özyilmaz, Barbaros.

In: Scientific reports, Vol. 3, 3404, 03.12.2013.

Research output: Contribution to journalArticle

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