Shuigang Xu

Emerging thin film technology

School of Science, Westlake University, Hangzhou, China

Email: xushuigang@westlake.edu.cn

Biography

Dr. Shuigang Xu received his bachelor’s degree from Wuhan University in 2009, and Ph.D. degree from the Hong Kong University of Science and Technology in 2013. He worked as a postdoc in the Hong Kong University of Science and Technology from 2013 to 2016 and in University of Manchester from 2016 to 2021. In September 2021, he started his new role as an assistant professor and built 2D Materials and Quantum Transport Laboratory in Westlake University.

Abstract for Presentation

Engineering van der Waals heterostructures for emergent quantum transport

Two-dimensional (2D) materials, such as graphene, MoS2, consist of atomically thin crystal layers weakly bonded by van der Waals force. The reduced dimensionality in 2D materials offers many novel quantum phenomena and promising electronic applications in the post-Moore’s Law era. Different 2D materials can be assembled into designer van der Waals (vdWs) heterostructures layer by layer, as building Lego, but with atomic precision. In vdWs heterostructures, the clean interfaces owing to the self-cleaning effect and no lattice mismatch requirement preserve individual properties of each involved layer and guarantee the strong interlayer interaction, making it possible to create various emergent artificial materials with multifunctional properties and exotic phenomena. Therefore, 2D materials and vdWs heterostructures provide an opportunity to create materials on demand with various appealing functionalities, including light emitting diodes, tunneling transistors, nanoscale sensors, spintronic and valleytronic devices. In this talk, I will show how we engineer vdWs heterostructures by various technologies to achieve bubble-free interface, Moiré superlattice, metastable phase, etc. With these designer vdWs, we observed emergent quantum phenomena in 2D systems, such as electron’s fluid, strong correlations, unconventional quantum hall states.

References

[1] Shuigang Xu, Mohammed M. Al Ezzi, Nilanthy Balakrishnan, Aitor Garcia-Ruiz, Bonnie Tsim, Ciaran Mullan, Julien Barrier, Na Xin, Benjamin A. Piot, Takashi Taniguchi, Kenji Watanabe, Alexandra Carvalho, Artem Mishchenko, A. K. Geim, Vladimir I. Fal'ko, Shaffique Adam, Antonio Helio Castro Neto, Kostya S. Novoselov, Yanmeng Shi, Nat. Phys., 17 (2021) 619–626.

[2] Yanmeng Shi, Shuigang Xu, Yaping Yang, Sergey Slizovskiy, Sergey V. Morozov, Seok-Kyun Son, Servet Ozdemir, Ciaran Mullan, Julien Barrier, Jun Yin, Alexey I. Berdyugin, Benjamin A. Piot, Takashi Taniguchi, Kenji Watanabe, Vladimir I. Fal’ko, Kostya S. Novoselov, A. K. Geim, Artem Mishchenko, Nature, 584 (2020) 210-214,.

[3] A. I. Berdyugin, S. G. Xu, F. M. D. Pellegrino, R. Krishna Kumar, A. Principi, I. Torre, M. Ben Shalom, T. Taniguchi, K. Watanabe, I. V. Grigorieva, M. Polini, A. K. Geim, D. A. Bandurin, Science, 364 (2019) 162-165.

[4] S. G. Xu, A. I. Berdyugin, P. Kumaravadivel, F. Guinea, R. Krishna Kumar, D. A. Bandurin, S. V. Morozov, W. Kuang, B. Tsim, S. Liu, J. H. Edgar, I. V. Grigorieva, V. I. Fal’ko, M. Kim, A. K. Geim, Nat. Commun., 10 (2019) 4008.

[5] Shuigang Xu, Junying Shen, Gen Long, Zefei Wu, Zhi-qiang Bao, Cheng-Cheng Liu, Xiao Xiao, Tianyi Han, Jiangxiazi Lin, Yingying Wu, Huanhuan Lu, Jianqiang Hou, Liheng An, Yuanwei Wang, Yuan Cai, K. M. Ho, Yuheng He, Rolf Lortz, Fan Zhang, Ning Wang, Phys. Rev. Lett., 118 (2017) 067702.