报告题目：Two-Dimensional Material Optoelectronics and Electronics

报 告 人：Fengnian Xia，Department of Electrical Engineering, Yale University

报告时间：2016年7月11日15：00

报告地点：理科楼C302

报告摘要：Two-dimensional materials exhibit diverse electronic properties, ranging from metallic graphene and semiconducting transition metal dichalcogenides such as molybdenum disulphide, to insulating hexagonal boron nitride [1]. In this talk, I will first address the physics of light-graphene interaction within the single-electron framework, followed by a discussion of light excitation of collective oscillations of the carriers, i.e., plasmons in graphene. I will focus on the unique graphene plasmonic properties arising from its “massless” carriers [2-3]. Then I will briefly cover the advantages and disadvantages of semiconducting transition metal dichalcogenides in optoelectronics and electronics if compared with graphene. Finally I will discuss a few promising future research directions using recently rediscovered black phosphorus [4-6], which serendipitously bridges the zero-gap graphene and the relatively large-bandgap transition metal dichalcogenides such as molybdenum disulfide (MoS₂).

1. F. Xia, H. Wang, D. Xiao, M. Dubey, and A. Ramasubramaniam, “Two-dimensional material nanophotonics,” Nature Photonics 8, 899-907 (2014).

2. H. Yan, X. Li, B. Chandra, G. Tulevski, Y. Wu, M. Freitag, W. Zhu, P. Avouris, and F. Xia, “Tunable infrared plasmonic devices using graphene/insulator stacks,” Nature Nanotechnology 7, 330-334 (2012).

3. H. Yan, T. Low, W. Zhu, Y. Wu, M. Freitag, X. Li, F. Guinea, P. Avouris, and F. Xia, “Damping pathways of mid-infrared plasmons in graphene nanostructures,” Nature Photonics 7, 394-399 (2013).

4. H. Wang, X. Wang, F. Xia, L. Wang, H. Jiang, Q. Xia, M. L. Chin, M. Dubey, and S.-J. Han, “Black Phosphorus Radio-Frequency Transistors,” Nano Letters 14, 6424–6429 (2014).

5. X. Ling, H. Wang, S. Huang, F. Xia, and M. S. Dresselhaus, “The renaissance of black phosphorus,” Proceedings of the National Academy of Sciences 112, 4523-4530 (2015).

6. X. Wang, A. M. Jones, K. L. Seyler, V. Tran, Y. Jia, H. Zhao, H. Wang, L. Yang, X. Xu, and F. Xia, “Highly Anisotropic and Robust Excitons in Monolayer Black Phosphorus,” Nature Nanotechnology 10, 517–521 (2015).