Mechanically-tunable bandgap closing in 2D graphene phononic crystals.

ABSTRACT: We present a tunable phononic crystal which can be switched from a mechanically insulating to a mechanically conductive (transmissive) state. Specifically, in our simulations for a phononic lattice under biaxial tension (σ _xx = σ _yy = 0.01 N m^-1), we find a bandgap for out-of-plane phonons in the range of 48.8-56.4 MHz, which we can close by increasing the degree of tension uniaxiality (σ _xx/σ _yy) to 1.7. To manipulate the tension distribution, we design a realistic device of finite size, where σ _xx/σ _yy is tuned by applying a gate voltage to a phononic crystal made from suspended graphene. We show that the bandgap closing can be probed via acoustic transmission measuremen

SUBMITTER: Kirchhof JN 

PROVIDER: S-EPMC11466820 | biostudies-literature | 2023

REPOSITORIES: biostudies-literature