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141961 |
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|a Yang, Jixiang
|e author
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|a Chen, Guorui
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|a Han, Tianyi
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|a Zhang, Qihang
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|a Zhang, Ya-Hui
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|a Jiang, Lili
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|a Lyu, Bosai
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|a Li, Hongyuan
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|a Watanabe, Kenji
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|a Taniguchi, Takashi
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|a Shi, Zhiwen
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|a Senthil, Todadri
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|a Zhang, Yuanbo
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|a Wang, Feng
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|a Ju, Long
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|a Spectroscopy signatures of electron correlations in a trilayer graphene/hBN moiré superlattice
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|b American Association for the Advancement of Science (AAAS),
|c 2022-04-20T12:27:23Z.
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|z Get fulltext
|u https://hdl.handle.net/1721.1/141961
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|a <jats:p>ABC-stacked trilayer graphene/hexagonal boron nitride moiré 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 moiré 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 ~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.</jats:p>
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|a en
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|a Article
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|t 10.1126/science.abg3036
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773 |
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|t Science
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