Topological Acoustic Diode

• URL: http://arxiv.org/abs/2601.20951v1
• Date: Wed, 28 Jan 2026 19:00:05 GMT
• Title: Topological Acoustic Diode
• Authors: Ashwat Jain, Wojciech J. Jankowski, M. Mehraeen, Robert-Jan Slager,
• Abstract summary: We show that certain three-dimensional topological phases can act as acoustic diodes realizing odd acoustoelastic effects.<n>Our findings reveal unexplored avenues for experimental realizations of acoustic diodes using effective $$ vacua of axion insulators adaptable for topological engineering applications.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We show that certain three-dimensional topological phases can act as acoustic diodes realizing nonlinear odd acoustoelastic effects. Beyond uncovering topologically-induced anomalous acoustic second-harmonic generation and rectification, we demonstrate how such nonlinear responses are uniquely captured by the momentum-space nonmetricity tensor in the quantum state Hilbert-space geometry. In addition to completing the classification of quantum geometric observables in the quadratic response regime, our findings reveal unexplored avenues for experimental realizations of acoustic diodes using effective $θ$ vacua of axion insulators adaptable for topological engineering applications.

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