Accurate Measurement of the Gap of Graphene / h − BN Moiré Superlattice through Photocurrent Spectroscopy
Name
PhysRevLett.126.146402.pdf
Description
Published version
Size
1.16 MB
Format
Adobe PDF
Checksum (MD5)
05cccb62c158458d23a48fb195683f17
Author(s)
Han, Tianyi
Yang, Jixiang
Zhang, Qihang
Wang, Lei
Watanabe, Kenji
Taniguchi, Takashi
McEuen, Paul L
Ju, Long
Date Issued
2021
Journal
Physical Review Letters
Publisher
American Physical Society (APS)
Citation
Han, Tianyi, Yang, Jixiang, Zhang, Qihang, Wang, Lei, Watanabe, Kenji et al. 2021. "Accurate Measurement of the Gap of Graphene / h − BN Moiré Superlattice through Photocurrent Spectroscopy." Physical Review Letters, 126 (14).
Version
Final published version
Abstract
Monolayer graphene aligned with hexagonal boron nitride (h-BN) develops a gap at the charge neutrality point (CNP). This gap has previously been extensively studied by electrical transport through thermal activation measurements. Here, we report the determination of the gap size at the CNP of graphene/h-BN superlattice through photocurrent spectroscopy study. We demonstrate two distinct measurement approaches to extract the gap size. A maximum of ∼14 meV gap is observed for devices with a twist angle of less than 1°. This value is significantly smaller than that obtained from thermal activation measurements, yet larger than the theoretically predicted single-particle gap. Our results suggest that lattice relaxation and moderate electron-electron interaction effects may enhance the CNP gap in graphene/h-BN superlattice.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PHYSREVLETT.126.146402
