2022/10/24(Mon) 14:00 -16:00 一樓演講廳 1F, Auditorium
Title
Quantum straintronics and topological photonics/optoelectronics based on two-dimensional van der Waals materials
Speaker
葉乃裳教授 (Department of Physics, California Institute of Technology, USA) Prof. Nai-Chang Yeh (Department of Physics, California Institute of Technology, USA)Abstract
Two-dimensional (2D) van der Waals (vdW) materials, such as graphene, hexagonal boron nitride (h-BN) and transition metal dichalcogenides (TMDs), exhibit a rich variety of properties that can be further tailored to achieve novel functionalities by strain engineering and light-matter interaction. In this talk I will describe a new paradigm of quantum straintronics for controlling the 2D electronic correlation and bandstructures via nanoscale strain engineering of single layer (SL) graphene, [1,2] and a new strategy to design novel topological photonics and optoelectronics via interactions of topological charges from optical and/or plasmonic vortices with different 2D-vdW materials. [3,4]
** References:
[1] “Nanoscale engineering of giant pseudo-magnetic fields, valley polarization and topological channels in strained graphene”, C.-C. Hsu, M. L. Teague, J.-Q. Wang, and N.-C. Yeh*, Science Advances 6, aat9488 (2020).
[2] “Nanoscale strain engineering of graphene and graphene-based devices”, N.-C. Yeh*, C.-C. Hsu, M. L. Teague, J.-Q. Wang, D. A. Boyd and C.-C. Chen, (invited paper), Acta Mechanica Sinica 32 (3), 497 – 509 (2016).
[3] “Dramatically enhanced valley-polarized emission of monolayer WS2 at room temperature with plasmonic Archimedes spiral nanostructures and gated control”, W.-H. Lin*, P. C. Wu, H. Akbari, G. R. Rossman, N.-C. Yeh*, and H. A. Atwater*, Advanced Materials 34 (3), 2104863 (2022).
[4] “Control of trion-to-exciton conversion in monolayer WS2 by orbital angular momentum of light”, R. Kesarwani, K. B. Simbulan, T.-D. Huang, Y.-F. Chiang, N.-C. Yeh*, Y.-W. Lan*, and T.-H. Lu*, Science Advances 8, eabm0100 (2022).
Poster
Language
演講語言 (Language): in English