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  • Rapid Communication
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Magic-angle bilayer phononic graphene

Yuanchen Deng1,*, Mourad Oudich1,2,*, Nikhil JRK Gerard3, Jun Ji1, Minghui Lu4, and Yun Jing1,†

  • 1Graduate Program in Acoustics, Penn State University, University Park, Pennsylvania 16802, USA
  • 2Université de Lorraine, CNRS, Institut Jean Lamour, F-54000 Nancy, France
  • 3Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, North Carolina 27695, USA
  • 4National Laboratory of Solid State Microstructures and Department of Materials Science and Engineering, Nanjing University, Nanjing, Jiangsu 210093, China

  • *These authors contributed equally to this work.
  • †yqj5201@psu.edu
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Phys. Rev. B 102, 180304(R) – Published 20 November, 2020

DOI: https://doi.org/10.1103/PhysRevB.102.180304

Abstract

Thanks to the recent discovery of the magic-angle bilayer graphene, twistronics is quickly becoming a burgeoning field in condensed matter physics. This Rapid Communication expands the realm of twistronics to acoustics by introducing twisted bilayer phononic graphene, which remarkably also harbors the magic angle, evidenced by the associated ultraflat bands. Beyond mimicking quantum-mechanical behaviors of twisted bilayer graphene, we show that their acoustic counterpart offers a considerably more straightforward and robust way to alter the interlayer hopping strength, enabling us to unlock magic angles (>3∘) inaccessible in classical twisted bilayer graphene. This study not only establishes the acoustical analog of twisted (magic-angle) bilayer graphene, providing a test bed more easily accessible to probe the interaction and misalignment between stacked two-dimensional materials, but also points out the direction to a new phononic crystal design paradigm that could benefit applications such as enhanced acoustic emission and sensing.

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See Also

Flat Bands in Magic-Angle Vibrating Plates

María Rosendo López, Fernando Peñaranda, Johan Christensen, and Pablo San-Jose
Phys. Rev. Lett. 125, 214301 (2020)

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Outline

Information

Phys. Rev. B 102, 180304(R)– Published 20 November, 2020
  • Received 21 May 2020
  • Revised 13 October 2020
  • Accepted 14 October 2020
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