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【2024年12月4日】声子斯格明子:构建声音和振动的新视野?

2024-12-31
【 字号:
主讲人 Prof. Badreddine Assouar 时间 2024年12月4日15:00-16:30
地点 四平路校区衷和楼405

主讲人

Prof. Badreddine Assouar is currently a Director of Researchat the CNRS. In 2024, Prof. Assouar has been elected a Fellow of the European Academy of Sciences. He is also serving as Associate Editor with Physical Review Applied since 2019. Prof. Assouar is author or co-author of more than 150 international peer reviewed publications, in leading international journals including, Phys. Rev. Lett., Nature Communications, Nature Review Materials, Science Advances, Phys. Rev. Applied..., and more than 50 invited talks and keynotes over the world. This has led to highly recognition of his works and achievements over the past 15 years, as indicated by the high citations rate his works has collected  (>10000 citations, and h-index of 56).

讲座主题

Elastic phonons are an excellent platform for information processing due to their low phononic wavelength, scalability, and extremely low losses. These characteristics make them ideal for high signal-to-noise information processing, high sensitivity remote sensing, and quantum network technologies. The development of phononic skyrmions, a topologically robust mode, could sianificantly enhancephononic applications, especially in scalable confiqurationsfor future chip-scale technologies. Recent advancements have revealed the hybrid spin induced by mixed transverse-longitudinal waves in elastic phononic systems, which gives rise to unique phenomena that go beyond traditional acousticwave behavior. This hybrid spin allows for strong spinmomentum locking of elastic edge modes. However, the trivial topological invariant of these edge modes is not defectresistant. This talk will discuss the construction of nontrivial ultra-broadband phononic skyrmions based on three-dimensional hybrid spin. lt will also explore how spin angular momentum can serve as a new degree of freedom for manipulating wave propagation. Examples from photonic and acoustic systems will be presented, followed by a focus on phononic skyrmions and their potential for enableing more advanced functionalities in engineering applications.