Journal
PHYSICAL REVIEW LETTERS
Volume 125, Issue 23, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.125.236102
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Funding
- National Natural Science Foundation of China [11974050, 11674029]
- National Program for Support of Top-notch Young Professionals
- Fundamental Research Funds for the Central Universities
- Chang Jiang Scholars Program
- U.S. Department of Energy through the Los Alamos National Laboratory (LANL) LDRD program
- Center for Non-linear Studies at LANL
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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 theta(c). Experimentally, the theta(c) is demonstrated to be very close to the magic angle (theta approximate to 1.08 degrees). 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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