Tunable Lattice Reconstruction, Triangular Network of Chiral One-Dimensional States, and Bandwidth of Flat Bands in Magic Angle Twisted Bilayer Graphene

Liu, Yi-Wen; Su, Ying; Zhou, Xiao-Feng; Yin, Long-Jing; Yan, Chao; Li, Si-Yu; Yan, Wei; Han, Sheng; Fu, Zhong-Qiu; Zhang, Yu; Yang, Qian; Ren, Ya-Ning; He, Lin

doi:10.1103/physrevlett.125.236102

Title: Tunable Lattice Reconstruction, Triangular Network of Chiral One-Dimensional States, and Bandwidth of Flat Bands in Magic Angle Twisted Bilayer Graphene

Journal Article · Tue Dec 01 00:00:00 EST 2020 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.125.236102· OSTI ID:1760603

Liu, Yi-Wen ^[1];

^[2]; Zhou, Xiao-Feng ^[1];

^[3]; Yan, Chao ^[1]; Li, Si-Yu ^[3]; Yan, Wei ^[1]; Han, Sheng ^[1]; Fu, Zhong-Qiu ^[1]; Zhang, Yu ^[1]; Yang, Qian ^[1]; Ren, Ya-Ning ^[1];

^[1]

Beijing Normal Univ. (China). Center for Advanced Quantum Studies
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Beijing Normal Univ. (China). Center for Advanced Quantum Studies; Hunan Univ. (China)

The interplay between interlayer van der Waals interaction and intralayer lattice distortion can lead to structural reconstruction in slightly twisted bilayer graphene (TBG) with the twist angle being smaller than a characteristic angle θ_c. Experimentally, the θ_c is demonstrated to be very close to the magic angle (θ≈1.08°). Here we address the transition between reconstructed and unreconstructed structures of the TBG across the magic angle by using scanning tunneling microscopy (STM). Our experiment demonstrates that both structures are stable in the TBG around the magic angle. By using a STM tip, we show that the two structures can be changed to each other and a triangular network of chiral one-dimensional states hosted by domain boundaries can be switched on and off. Consequently, the bandwidth of the flat band, which plays a vital role in the emergent strongly correlated states in the magic angle TBG, is tuned. This provides an extra control knob to manipulate the exotic electronic states of the TBG near the magic angle.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program; National Natural Science Foundation of China (NSFC)

Grant/Contract Number:: 89233218CNA000001; 11974050; 11674029

OSTI ID:: 1760603

Report Number(s):: LA-UR-20-24943; TRN: US2206033

Journal Information:: Physical Review Letters, Vol. 125, Issue 23; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Tunable Lattice Reconstruction, Triangular Network of Chiral One-Dimensional States, and Bandwidth of Flat Bands in Magic Angle Twisted Bilayer Graphene

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