Journal
SCIENCE
Volume 375, Issue 6586, Pages 1295-+Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.abg3036
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Funding
- STC Center for Integrated Quantum Materials, NSF [DMR1231319]
- Skolkovo Institute of Science and Technology as part of the MIT Skoltech Program
- Center for Novel Pathways to Quantum Coherence in Materials, an Energy Frontier Research Center - US Department of Energy, Office of Science, Basic Energy Sciences
- National Key Research Program of China [2020YFA0309000, 2021YFA1400100]
- NSF of China [12174248]
- Shanghai Jiao Tong University [21X010200846]
- Elemental Strategy Initiative by the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan [JPMXP0112101001]
- Japan Society for the Promotion of Science (JSPS) [JP20H00354]
- CREST, Japan Science and Technology Agency (JST) [JPMJCR15F3]
- National Key Research and Development Program of China [2016YFA0302001]
- National Natural Science Foundation of China [11774224, 12074244]
- US Department of Energy [DE-SC0008739]
- Simons Investigator award from the Simons Foundation
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We report spectroscopy measurements of dual-gated TLG/hBN using Fourier transform infrared photocurrent spectroscopy and observe optical transitions and bandgap opening, providing insights into the electron correlation in TLG/hBN.
ABC-stacked trilayer graphene/hexagonal boron nitride moire superlattice (TLG/hBN) has emerged as a playground for correlated electron physics. We report spectroscopy measurements of dual-gated TLG/hBN using Fourier transform infrared photocurrent spectroscopy. We observed a strong optical transition between moire minibands that narrows continuously as a bandgap is opened by gating, indicating a reduction of the single-particle bandwidth. At half-filling of the valence flat band, a broad absorption peak emerges at similar to 18 milli-electron volts, indicating direct optical excitation across an emerging Mott gap. Similar photocurrent spectra are observed in two other correlated insulating states at quarter- and half-filling of the first conduction band. Our findings provide key parameters of the Hubbard model for the understanding of electron correlation in TLG/hBN.
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