Acoustic cavities in 2D heterostructures

Maxim K. Zalalutdinov (), Jeremy T. Robinson (), Jose J. Fonseca, Samuel W. LaGasse, Tribhuwan Pandey, Lucas R. Lindsay, Thomas L. Reinecke, Douglas M. Photiadis, James C. Culbertson, Cory D. Cress and Brian H. Houston
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Maxim K. Zalalutdinov: US Naval Research Laboratory
Jeremy T. Robinson: US Naval Research Laboratory
Jose J. Fonseca: NRC Postdoctoral Fellow at Naval Research Laboratory
Samuel W. LaGasse: NRC Postdoctoral Fellow at Naval Research Laboratory
Tribhuwan Pandey: University of Antwerp
Lucas R. Lindsay: Materials Science and Technology Division, Oak Ridge National Laboratory
Thomas L. Reinecke: US Naval Research Laboratory
Douglas M. Photiadis: US Naval Research Laboratory
James C. Culbertson: US Naval Research Laboratory
Cory D. Cress: US Naval Research Laboratory
Brian H. Houston: US Naval Research Laboratory

Nature Communications, 2021, vol. 12, issue 1, 1-11

Abstract: Abstract Two-dimensional (2D) materials offer unique opportunities in engineering the ultrafast spatiotemporal response of composite nanomechanical structures. In this work, we report on high frequency, high quality factor (Q) 2D acoustic cavities operating in the 50–600 GHz frequency (f) range with f × Q up to 1 × 1014. Monolayer steps and material interfaces expand cavity functionality, as demonstrated by building adjacent cavities that are isolated or strongly-coupled, as well as a frequency comb generator in MoS2/h-BN systems. Energy dissipation measurements in 2D cavities are compared with attenuation derived from phonon-phonon scattering rates calculated using a fully microscopic ab initio approach. Phonon lifetime calculations extended to low frequencies (

Date: 2021
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DOI: 10.1038/s41467-021-23359-7

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