Abstract:
2D layered materials, particularly semiconducting transition metal dichalcogenides (TMDs), such as MoS2 and WSe2, have attracted tremendous research works, due not only to their atomically thin thickness, but also to many exciting new phenomena associated with new materials. Recent advances in heterostructures formed by vertically stacked or laterally stitched 2D semiconductors further show their promise for novel device applications. In this talk, I will present our recent endeavors on the material synthesis and fundamental study of 2D TMDs. In particular, I shall demonstrate our recent progress on new TMDs, such as PtSe2 and PdSe2 grown of by chemical vapor deposition. In the second part, I will demonstrate some progress on new coupled spin-valley physics in TMD vertical heterojunctions caused by the interlayer quantum inference. Interlayer coupling and Moiré superlattice in twisted hetero-bilayers will be presented.
References:
1. W.-T. Hsu, L.-S. Lu, P.-H. Wu, M.-H. Lee, P.-J. Chen, P.-Y. Wu, Y.-C. Chou, H.-T. Jeng, L.-J. Li,
M.-W. Chu & W.-H. Chang*, Nature Comm. 2018, 9, 1356.
2. W.-T. Hsu, L.-S. Lu, D. Wang, J.-K. Huang, M.-Y. Li, T.-R. Chang, Y.-C. Chou, Z.-Y. Juang, H.-T. Jeng, L.-J. Li & W.-H. Chang*, Nature Comm. 2017,8, 929.
3. W.-T. Hsu, Y.-L. Chen, C.-H. Chen, P.-S. Liu, T.-H. Hou, L.-J. Li & W.-H. Chang*, Nature Comm. 2015, 6, 8963.
4. M.-Y. Li, Y. Shi, C.-C. Cheng, L.-S. Lu, Y.-C. Lin, H.-L. Tang, M.-L. Tsai, C.-W. Chu, K.-H. Wei, J.-H. He, W.-H. Chang, K. Suenaga, L.-J. Li*, Science 2015, 349, 524-528.
Brief Bio:
Dr. Chang is currently a distinguished professor of physics at National Chiao Tung University (NCTU), Taiwan. He received his BS (1994), MS (1996) and PhD (2001) degrees in Physics from National Central University (NCU), Taiwan. After his postdoctoral research at NCU, he joined the Department of Electrophysics at NCTU as an assistant professor in 2005 and became a full professor since 2012. His research interests include light-matter interactions in semiconductor nanostructures, nanophotonics/plasmonics hybrid systems, and 2D layered materials. He has authored and co-authored more than 100 journal papers and received citation more than 4,800 times with an h index of 31, according to Google Scholar. He was awarded the Ta-Yu Wu Memorial Award of the Ministry of Science and Technology of Taiwan in 2010 and Sun Yet-Sen Academic Award in 2018. Dr. Chang is the Editor of Chinese Journal of Physics and the Editorial Board Members of Scientific Report. Dr. Chang now also serves as the Convener of the Physics Discipline of the Ministry of Science and Technology of Taiwan.