On-chip valley topological materials for elastic wave manipulation
| Autor: | Feng Li, Xueqin Huang, Zhengyou Liu, Mou Yan, Jiahong Ma, Jiuyang Lu, Weiyin Deng |
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| Rok vydání: | 2018 |
| Předmět: |
Silicon
chemistry.chemical_element 02 engineering and technology Electron Edge (geometry) Topology 01 natural sciences Intersection 0103 physical sciences General Materials Science 010306 general physics Physics::Atmospheric and Oceanic Physics Topology (chemistry) Randomness Physics business.industry Mechanical Engineering General Chemistry Acoustic wave Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology Condensed Matter Physics chemistry Mechanics of Materials Photonics 0210 nano-technology business |
| Zdroj: | Nature materials. 17(11) |
| ISSN: | 1476-4660 |
| Popis: | Valley topological materials, in which electrons possess valley pseudospin, have attracted a growing interest recently. The additional valley degree of freedom offers a great potential for its use in information encoding and processing. The valley pseudospin and valley edge transport have been investigated in photonic and phononic crystals for electromagnetic and acoustic waves, respectively. In this work, by using a micromanufacturing technology, valley topological materials are fabricated on silicon chips, which allows the observation of gyral valley states and valley edge transport for elastic waves. The edge states protected by the valley topology are robust against the bending and weak randomness of the channel between distinct valley Hall phases. At the channel intersection, a counterintuitive partition of the valley edge states manifests for elastic waves, in which the partition ratio can be freely adjusted. These results may enable the creation of on-chip high-performance micro-ultrasonic materials and devices. |
| Databáze: | OpenAIRE |
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