Breakdown of the Interlayer Coherence in Twisted Bilayer Graphene

Title
Breakdown of the Interlayer Coherence in Twisted Bilayer Graphene
Authors
김영욱윤호열남승걸손민혁이동수김동철서순애최희철이후종이상욱김준성
Keywords
graphene; bilayer graphene; interlayer tunneling; twisted bilayer graphene
Issue Date
2013-03
Publisher
Physical review letters
Citation
VOL 110, NO 9, 096602-1-096602-5
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.
URI
http://pubs.kist.re.kr/handle/201004/44583
ISSN
00319007
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KIST Publication > Article
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