Bound states in the continuum for tunable high-Q PZT resonators in axion dark matter detection
Résumé
Axion dark matter detection through the piezoaxionic effect exploits the coupling between axion fields and piezoelectric crystals with aligned nuclear spins, where axion-induced stress excites bulk acoustic modes (BAMs). The detection sensitivity of such experiments is strongly dependent on the quality factor (Q) of the resonator, while efficient scanning requires tunability across a wide frequency range corresponding to the axion mass window (10⁻¹¹–10⁻⁷ eV). Conventional strategies, which involve arrays of high-Q resonators, are limited in scalability and practicality. In this work, we propose a new approach based on bound states in the continuum (BICs) in coupled centimeter-scale lead zirconate titanate (PZT) resonators. We show how BIC-induced suppression of radiative losses can enhance the Q-factor by an order of magnitude and, at the same time, enable frequency tuning via passive capacitive and inductive components. This dual advantage makes BIC-enabled PZT resonators a promising platform for high-sensitivity, broadband axion dark matter searches.
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