Abstract:
I will be presenting our recent efforts and results on probing and understanding new physical phenomena in low-dimensional materials. Our samples are ultraclean either prepared by a direct growth on substrates or encapsulated by hexagonal boron nitride (hBN). Our probing technique combines far-field spectroscopy, near-field optical nanoscopy together with the low-temperature electrical transport. Following these, I will focus on three main results in my talk: 1. Correlation of electron tunneling and plasmon propagation in crossed metallic carbon nanotubes[1]; 2. Fizeau drag of plasmon polaritons by electron flow in monolayer graphene[2]; 3. Significant moiré effect on optical transitions in one-dimensional moiré superlattices[3].
[1] S. Zhao#, S. Wang#, F. Wu, W. Shi, M. I. B. Utama, T. Lyu, L. Jiang, Y. Su, S. Wang, K. Watanabe, T. Taniguchi, A. Zettl, X. Zhang, C. Zhou*, F. Wang*. Correlation of Electron Tunneling and Plasmon Propagation in a Luttinger Liquid. Phys. Rev. Lett. 121,047702 (2018)
[2] W. Zhao#, S. Zhao#, H. Li, S. Wang, S. Wang, M. I. B. Utama, S. Kahn, Y. Jiang, X. Xiao, S. Yoo, K. Watanabe, T. Taniguchi, A. Zettl, F. Wang*. Efficient Fizeau Drag from Dirac electrons in monolayer graphene. Nature 594, 517-521 (2021) & Nature News and Views
[3] S. Zhao*, P. Moon, Y. Miyauchi, T. Nishihara, K. Matsuda, M. Koshino, R. Kitaura*. Observation of Drastic Electronic-Structure Change in a One-Dimensional Moiré Superlattice. Phys. Rev. Lett. 124, 106101 (2020) & Editors’ Suggestion
Biography:
Dr. Sihan Zhao became a tenure-track professor from Jan. 2021 in the Department of Physics, Zhejiang University (ZJU). He was recruited as a ZJU 100 Young Professor. He previously was a postdoctoral employee (2016-2020) working with Prof. Feng Wang in the Department of Physics, University of California at Berkeley. He received his Ph.D. from Nagoya University, Japan (Dec. 2015) under the supervision of Prof. Hisanori Shinohara & Prof. Ryo Kitaura. He received his Bachelor's Degree from Jilin University, China (July 2010).
Seminar by the NYU-ECNU Institute of Physics at NYU Shanghai