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원자제어 저차원 전자계 연구단
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Robust Interlayer-Coherent Quantum Hall States in Twisted Bilayer Graphene

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Title
Robust Interlayer-Coherent Quantum Hall States in Twisted Bilayer Graphene
Author(s)
Kim, Dohun; Kang, Byungmin; Choi, Yong-Bin; Watanabe, Kenji; Taniguchi, Takashi; Lee, Gil-Ho; Gil Young Cho; Kim, Youngwook
Publication Date
2023-01
Journal
Nano Letters, v.23, no.1, pp.163 - 169
Publisher
American Chemical Society
Abstract
We introduce a novel two-dimensional electronic system with ultrastrong interlayer interactions, namely, twisted bilayer graphene with a large twist angle, as an ideal ground for realizing interlayer-coherent excitonic condensates. In these systems, sub-nanometer atomic separation between the layers allows significant interlayer interactions, while interlayer electron tunneling is geometrically suppressed due to the large twist angle. By fully exploiting these two features we demonstrate that a sequence of odd-integer quantum Hall states with interlayer coherence appears at the second Landau level (N = 1). Notably the energy gaps for these states are of order 1 K, which is several orders of magnitude greater than those in GaAs. Furthermore, a variety of quantum Hall phase transitions are observed experimentally. All the experimental observations are largely consistent with our phenomenological model calculations. Hence, we establish that a large twist angle system is an excellent platform for high-temperature excitonic condensation.
URI
https://pr.ibs.re.kr/handle/8788114/13189
DOI
10.1021/acs.nanolett.2c03836
ISSN
1530-6984
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > 1. Journal Papers (저널논문)
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