Experimental Demonstration of Dual-Band Nano-Electromechanical Valley-Hall Topological Metamaterials
© 2021 Wiley-VCH GmbH.
| Veröffentlicht in: | Advanced materials (Deerfield Beach, Fla.). - 1998. - 33(2021), 10 vom: 19. März, Seite e2006521 |
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| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2021
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| Zugriff auf das übergeordnete Werk: | Advanced materials (Deerfield Beach, Fla.) |
| Schlagworte: | Journal Article integrated phononic circuits nano-electromechanical systems quantum valley-Hall effect topological insulators valley-momentum locking |
| Zusammenfassung: | © 2021 Wiley-VCH GmbH. Suppression of undesired backscattering of very-high-frequency elastic signals has been considered as a grand challenge in integrated phononic circuits. Originating from condensed-matter physics, valley-Hall topological insulators provide an intriguing strategy to overcome this challenge. To date, phononic valley-Hall topological insulators have been demonstrated only in bulk acoustic and mechanical systems operating at relatively low frequencies. Here, an integrated nano-electromechanical valley-Hall topological insulator operating in the very-high-frequency regime is experimentally realized. Valley kink states that are backscattering-immune against sharp bends and exhibit the "valley-momentum locking" effect simultaneously in the fundamental (≈60 MHz) and second-order (≈120 MHz) frequency bands are demonstrated. It is further shown that the propagation directions of these dual-band valley kink states are always locked to their valley pseudospins. The results not only enable various applications in very-high-frequency integrated phononic circuits with enhanced robustness and capacity, but also open the door to experimental exploration of mechanical nonlinearities, particularly those involving the fundamental and second-order frequencies, in topologically nontrivial nanostructures |
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| Beschreibung: | Date Revised 10.03.2021 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
| ISSN: | 1521-4095 |
| DOI: | 10.1002/adma.202006521 |