Topological phenomena, like the protected edge mode in which waves can travel around large imperfections without back-reflection, envision enticing applications. Although initially emerging from the study of the quantum Hall effect, topological phases are universal in various fields, including photonics, mechanics, and phononics. In this talk, I will discuss our topological phase engineering work, mainly some results of topological phononics in piezoactive materials, which are essential for applications in communications, quantum information science, sensing, etc. First, I will demonstrate valley Hall phases in piezoelectric AlN at GHz [Nat. Electron., 5, 157 (2022)]. Second, a theoretical framework for studying topological phases in piezoelectric and piezomagnetic materials will be discussed. Here I will reveal that an unexpected factor, the general duality relation, plays a crucial role in engineering symmetry breaking and topological phases [Nat. Commun., 14, 916 (2023)]. Some other results like the Klein tunneling in GHz phononic crystals will also be discussed.
Qicheng Zhang joined the School of Engineering at Westlake University as an Assistant Professor in the summer of 2023. He received his bachelor’s degree in Polymer Materials and Engineering from Zhejiang University in 2012. In 2016, he earned his Ph.D. in Chemical and Biomolecular Engineering from the Hong Kong University of Science and Technology, where he studied the properties of van der Waals materials. In 2018, he began his postdoc journey at the University of Pennsylvania, where he worked on developing rapid and scalable handheld devices of carbon nanotube gas sensors for disease screening, engineering van der Waals materials for exploration of their topological physics, and, more recently, integrated topological phononic circuitry.
Qicheng Zhang joined the School of Engineering at Westlake University as an Assistant Professor in the summer of 2023. He received his bachelor’s degree in Polymer Materials and Engineering from Zhejiang University in 2012. In 2016, he earned his Ph.D. in Chemical and Biomolecular Engineering from the Hong Kong University of Science and Technology, where he studied the properties of van der Waals materials. In 2018, he began his postdoc journey at the University of Pennsylvania, where he worked on developing rapid and scalable handheld devices of carbon nanotube gas sensors for disease screening, engineering van der Waals materials for exploration of their topological physics, and, more recently, integrated topological phononic circuitry.
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