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Abnormal conductivity in low-angle twisted bilayer graphene.

Shuai Zhang^1,2, Aisheng Song², Lingxiu Chen³

¹AML, CNMM, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China.

Science Advances

|November 21, 2020

Summary

Controlling twist angles in 2D van der Waals materials is key for tuning electronic properties. This study reveals nonmonotonic vertical conductivity in bilayer graphene due to atomic reconstruction, offering new design strategies.

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Area of Science:

Condensed Matter Physics
Materials Science
Nanotechnology

Background:

Tuning electronic properties of 2D van der Waals materials is achieved by controlling interlayer twist angles.
Electrical conductivity typically increases monotonically as twist angle decreases due to enhanced interlayer coupling.

Purpose of the Study:

To investigate the nonmonotonic angle-dependent vertical conductivity in bilayer graphene at low twist angles.
To understand the underlying mechanisms responsible for anomalous conductivity behavior.

Main Methods:

Density functional theory (DFT) calculations.
Scanning tunneling microscopy (STM).
Analysis of vertical conductivity across bilayer graphene interfaces.

Main Results:

Observed a nonmonotonic vertical conductivity behavior in bilayer graphene with twist angles below approximately 5°.
Vertical conductivity initially increases with decreasing twist angle, then drops sharply below a crossover angle (θc ≈ 5°).
Attributed the anomalous behavior to a reduction in average carrier density caused by local atomic reconstruction.

Conclusions:

Local atomic reconstruction significantly impacts vertical conductivity in low-angle twisted 2D materials.
This finding offers a novel strategy for designing and optimizing electronic performance in twisted van der Waals heterostructures.
The nonmonotonic conductivity dependence provides new avenues for electronic device applications.