期刊
PHYSICAL REVIEW LETTERS
卷 126, 期 14, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.126.146402
关键词
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资金
- STC Center for Integrated Quantum Materials, NSF [DMR1231319]
- Sloan Fund from the School of Science at MIT [2695400]
- Materials Research Laboratory (MRL) at MIT
- National Natural Science Foundation of China [12074173]
- Elemental Strategy Initiative by the MEXT, Japan [JPMXP0112101001]
- JSPS KAKENHI [JP20H00354]
- CREST, JST [JPMJCR15F3]
- Skolkovo Institute of Science and Technology, MIT Skoltech Program
- National Science Foundation [1541959]
By studying the graphene/h-BN superlattice using photocurrent spectroscopy, the gap size at the CNP was determined, with a maximum gap of about 14 meV observed for devices with a twist angle of less than 1 degree. The results suggest that lattice relaxation and moderate electron-electron interaction effects may enhance the CNP gap.
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 similar to 14 meV gap is observed for devices with a twist angle of less than 1 degrees. 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.
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