Research at FAST

Department of Applied Physics Department of Applied Physics 116 Qualification BSc (Fudan) PhD (CAS) Postdoc (Northwestern) ORCID ID 0000-0002-7720-8032 Prof. DAI Jiyan Professor Research Overview Research in Prof. Dai’s group focuses on ferroelectric and thin film materials and devices. Prof. Dai’s group recently demonstrated flexoelectricity in oxide heterostructure. It reveals that the flexoelectric effect in thin film material might be useful in future energy-harvesting devices or mechanical sensors. (Figure 1) Based on the LaAlO 3 /SrTiO 3 heterostructures, a series of sensing devices like polar liquid sensors, UV photodetectors and gas sensors have been demonstrated in his lab. In the study of topological materials, Prof. Dai’s group successfully fabricated ZrTe 2 thin film and demonstrated its exotic magneto-electrical transport properties. This work provides insights into further investigations and potential applications of this layered topological material system. (Figure 2) Representative Publications • Phys. Rev. Lett., 2019 , 122, 257601 • ACS Nano, 2019 , 13, 5, 6008-6016 • Sci. Adv., 2018 , 4, eaau5096 • Phys. Rev. B, 2017 , 95, 214304 • Phys. Rev. B, 2016 , 93, 214427 • Adv. Mater., 2014 , 26, 5962 • Adv. Mater., 2013 , 24, 2598 Figure 3 Awards and Achievements • First Class Award of Natural Science in Guangdong Province 2019 廣東省自然科學一等獎 • President Award in Research and Scholarly Activities, 2007 • Faculty Award in Research and Scholarly Activities, 2007 Patents • J.Y. Dai , S.F. Tee, C.L. Tay, E. Er, and R. Shailesh, Method for a Plan-view transmission electron microscopy sample preparation technique for via and contact characterization. US 6,683,304 • J.Y Dai , P.F. Lee and X.B. Lu, Process and apparatus for fabricating nano-floating gate memories and memory made thereby. US 7,585,721B2 • J. Peng, C. Chao, J.Y. Dai , and H.L.W. Chan, Piezoelectric Single cr ystalline thick film on silicon wafer for Piezoelectric micro-electro-mechanical systems, US Patent, US 8,536,665B2 Figure 1 Figure 2 Prof. Dai’s group has also been devoting in developing high-performance ultrasound transducers including phase-array, annular-array, high-frequency transducers as well as endoscopic and intravascular ultrasound transducers for medical imaging. While some inventions have been implemented and licensed to industry, these efforts and pioneer works have greatly accelerated the progress of China’s medical ultrasound imaging technology. (Figure 3)