Breakdown of the interlayer coherence in twisted bilayer graphene

Youngwook Kim, Hoyeol Yun, Seung Geol Nam, Minhyeok Son, Dong Su Lee, Dong Chul Kim, S. Seo, Hee Cheul Choi, Hu Jong Lee, Sang Wook Lee, Jun Sung Kim

Research output: Contribution to journalArticlepeer-review

70 Scopus citations

Abstract

Coherent motion of electrons in Bloch states is one of the fundamental concepts of charge conduction in solid-state physics. In layered materials, however, such a condition often breaks down for the interlayer conduction, when the interlayer coupling is significantly reduced by, e.g., a large interlayer separation. We report that complete suppression of coherent conduction is realized even in an atomic length scale of layer separation in twisted bilayer graphene. The interlayer resistivity of twisted bilayer graphene is much higher than the c-axis resistivity of Bernal-stacked graphite and exhibits strong dependence on temperature as well as on external electric fields. These results suggest that the graphene layers are significantly decoupled by rotation and incoherent conduction is a main transport channel between the layers of twisted bilayer graphene.

Original languageEnglish
Article number096602
JournalPhysical Review Letters
Volume110
Issue number9
DOIs
StatePublished - 27 Feb 2013

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