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Topological phononics is blooming nowadays. It combines the concepts of artificial crystals for acoustic waves with group theory. Of special interest is the creation of phononic crystal waveguides with desirable properties such as single-mode operation, symmetry-protection, and a relative immunity against backscattering by defects. The doctoral work could include steps of theory (group theory applied to symmetry in physics, topology of band structures), numerical simulation (finite elements for acoustic and elastic waves), and the achievement of demonstration experiments with underwater acoustic waves, surface water waves, and/or elastic waves in plates.
Laforge N, Laude V, Chollet F, Khelif A, Kadic M, Guo Y, Fleury R. Observation of topological gravity-capillary waves in a water wave crystal. New Journal of Physics. 2019 Aug 19;21(8):083031.
Makwana MP, Laforge N, Craster RV, Dupont G, Guenneau S, Laude V, Kadic M. Experimental observations of topologically guided water waves within non-hexagonal structures. Applied Physics Letters. 2020 Mar 30;116(13):131603.
Laforge N, Wiltshaw R, Craster RV, Laude V, Mart¨ªnez JA, Dupont G, Guenneau S, Kadic M, Makwana MP. Acoustic topological circuitry in square and rectangular phononic crystals. arXiv preprint arXiv:2012.08014. 2020 Dec 15. ·µ»ØÐ¡Ä¾³æ²é¿´¸ü¶à

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