Discovery of intrinsic van der Waals magnetic topological insulators

Monday, September 23, 2019 - 4:00pm

New materials are the driving force for technology innovations and our progressive understanding of condensed matter physics. In the last decade, breakthroughs have been made on topological materials. The discovery of bulk materials with non-trivial topology has led to rich new emergent phenomena, including Dirac surface state, Fermi arc surface state, chiral pumping effect, colossal photovoltaic effect, quantum anomalous Hall effect, etc. In this talk, I will present our discovery of a family of intrinsic van der Waals topological insulators. By reducing the interlayer magnetic exchange interaction, I will show that this family of materials can be tuned from antiferromagnetic to ferromagnetic, providing a superior material platform to investigate quantum anomalous Hall effect, Majorana fermions, etc. 

Prof. Ni Ni - UCLA
Guang Bian