التفاصيل البيبلوغرافية
| العنوان: |
Dirac cones and chiral selection of elastic waves in a soft strip. |
| المؤلفون: |
Lanoy, Maxime1 maxime.lanoy@gmail.com, Lemoult, Fabrice1, Eddi, Antonin2, Prada, Claire1 |
| المصدر: |
Proceedings of the National Academy of Sciences of the United States of America. 12/1/2020, Vol. 117 Issue 48, p1-5. 5p. |
| مصطلحات موضوعية: |
*ELASTIC waves, *ELASTIC wave propagation, *GROUP velocity, *NEUMANN boundary conditions, *CONES |
| مستخلص: |
We study the propagation of in-plane elastic waves in a soft thin strip, a specific geometrical and mechanical hybrid framework which we expect to exhibit a Dirac-like cone. We separate the low frequencies guided modes (typically 100 Hz for a 1-cm-wide strip) and obtain experimentally the full dispersion diagram. Dirac cones are evidenced together with other remarkable wave phenomena such as negative wave velocity or pseudo-zero group velocity (ZGV). Our measurements are convincingly supported by a model (and numerical simulation) for both Neumann and Dirichlet boundary conditions. Finally, we perform one-way chiral selection by carefully setting the source position and polarization. Therefore, we show that soft materials support atypical wavebased phenomena, which is all of the more interesting as they make most of the biological tissues. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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