Localized topological states beyond Fano resonances via counter-propagating wave mode conversion in piezoelectric microelectromechanical devices

Jacopo M. Ponti, Xuanyi Zhao, Luca Iorio, Tommaso Maggioli, Marco Colangelo, Benyamin Davaji, Raffaele Ardito, Richard V. Craster and Cristian Cassella ()
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Jacopo M. Ponti: Politecnico di Milano
Xuanyi Zhao: Northeastern University
Luca Iorio: Politecnico di Milano
Tommaso Maggioli: Northeastern University
Marco Colangelo: Northeastern University
Benyamin Davaji: Northeastern University
Raffaele Ardito: Politecnico di Milano
Richard V. Craster: Imperial College London
Cristian Cassella: Northeastern University

Nature Communications, 2024, vol. 15, issue 1, 1-7

Abstract: Abstract A variety of scientific fields like proteomics and spintronics have created a new demand for on-chip devices capable of sensing parameters localized within a few tens of micrometers. Nano and microelectromechanical systems (NEMS/MEMS) are extensively employed for monitoring parameters that exert uniform forces over hundreds of micrometers or more, such as acceleration, pressure, and magnetic fields. However, they can show significantly degraded sensing performance when targeting more localized parameters, like the mass of a single cell. To address this challenge, we present a MEMS device that leverages the destructive interference of two topological radiofrequency (RF) counter-propagating wave modes along a piezoelectric Aluminum Scandium Nitride (AlScN) Su-Schrieffer-Heeger (SSH) interface. The reported MEMS device opens up opportunities for further purposes, including achieving more stable frequency sources for communication and timing applications.

Date: 2024
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DOI: 10.1038/s41467-024-53925-8

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