Searching for substrate-supported 2D topological materials

  • Feng-Chuan Chuang Department of Physics, National Sun Yat-sen University

Abstract

Two-dimensional (2D) topological insulators (TIs), also known as quantum spin Hall (QSH) insulators, are recently discovered novel materials in which, even though the bulk material is insulating, the system still supports spin-polarized, gapless edge states with Dirac-cone-like linear energy dispersion. Growing substrate-supported 2D topological insulators which can be integrated into the modern silicon industry is highly desired for spintronics. In our previous works, we predicted serveral 2D topological insulators using first-principles electronic structure calculations, including planar Bi/Sb on insulating SiC substrate and surface alloys formed on chain-honeycomb-trimer (CHCT) of Au/Si(111)-√3 surface. Recently, we found that germanene asymmetrically functionalized with H and N atoms (GeHN) could harbor a quantum anomalous Hall (QAH) phase, due to an induced magnetization causing the time-reveral symmetry breaking. Moreover, N-passivated germanene on a CdTe substrate also supports the QAH phase. These findings suggest new opportunities for the scientists in the field of surface science.

About the Speaker

Feng-Chuan Chuang obtained his Bachelor's degree from the National Taiwan Normal University in 1997. He continued his graduate studies at Iowa State University and got his PhD in Condensed Matter Physics in 2005. He started his work at the National Sun Yat-Sen University in Kaohsiung, Taiwan as an Assistant Professor in 2006. He was the chairman of its Physics department from August 2014 to July 2016. Professor Chuang was given the National Sun Yat-sen University Young Scholar Award in 2010 and Outstanding Research Award in 2016. Currently, he is a university distinguished professor of the Department of Physics at the National Sun Yat-Sen University and the international affairs committee convener and one of the executive directors of the Physical Society of Taiwan.
His research interests include condensed matter physics, computational materials physics, surface science, first-principles calculations, molecular dynamics, and genetic algorithms. He has published works on atomic clusters, semiconductor and metal surfaces, graphene, topological insulators, and 2D materials. He has developed structural predictions algorithms and genetic algorithms to predict the atomic structures of materials. Recently, he predicted that numerous two-dimensional materials, as well as their derivatives, could be two-dimensional topological materials such as topological insulators and quantum anomalous Hall effect insulators. 

Published
2018-04-18
How to Cite
[1]
F.-C. Chuang. Searching for substrate-supported 2D topological materials, Proceedings of the Samahang Pisika ng Pilipinas 36, SPP-2018-INV-2E-02 (2018). URL: https://paperview.spp-online.org/proceedings/article/view/SPP-2018-INV-2E-02.