Towards tunable graphene phononic crystals
Y. Yu1,4, J.N. Kirchhof1,4, A. Tsarapkin2, V. Deinhart2,3, O. Yücel1, B. Höfer1, K. Höflich2 and K.I. Bolotin1
Published in:
2D Mater., vol. 10, no. 4, pp. 045012, doi:10.1088/2053-1583/acec58 (2023).
Abstract:
Phononic crystals (PnCs) are artificially patterned media exhibiting bands of allowed and forbidden zones for phonons — in analogy to the electronic band structure of crystalline solids arising from the periodic arrangement of atoms. Many emerging applications of PnCs from solid-state simulators to quantum memories could benefit from the on-demand tunability of the phononic band structure. Here, we demonstrate the fabrication of suspended graphene PnCs in which the phononic band structure is controlled by mechanical tension applied electrostatically. We show signatures of a mechanically tunable phononic band gap. The experimental data supported by simulation suggests a phononic band gap at 28–33 MHz in equilibrium, which upshifts by 9 MHz under a mechanical tension of 3.1 N m−1. This is an essential step towards tunable phononics paving the way for more experiments on phononic systems based on 2D materials.
1 Department of Physics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
2 Ferdinand-Braun-Institut gGmbH, Leibniz-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Str. 4, 12489 Berlin, Germany
3 Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, 14109 Berlin, Germany
4 Authors contributed equally to this work
Keywords:
nanomechanics, phononic crystal, graphene, optomechanics, resonators, NEMS
© 2023 The Author(s). Published by IOP Publishing Ltd
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