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BAQIS Internal Seminar 17: The road to high temperature quantum anomalous Hall effect in magnetic topological insulators

2020/06/30

Date: 30-Jun-2020
Time: 14:00-15:00
Venue: Tencent 
Speaker: Prof. Ke HE (Division of Quantum State of Matter)

Abstract: 
The quantum anomalous Hall effect is a quantum Hall effect that can occur without applied magnetic field. The effect has been experimentally realized in magnetically doped topologically insulators, but usually an ultralow temperature below 100 mK is required to observe full quantization of the anomalous Hall resistance and vanishing longitudinal resistance. Elevating the temperature to realize the quantum anomalous Hall effect to above 77 K or higher is crucial for its practical applications in electronics. In this talk, I will review the progresses in the past years on searching for higher temperature quantum anomalous Hall systems. Based on our understandings on these results, especially recent ones on magnetically intercalated topological insulators, we will give the principles and a roadmap for designing and constructing materials to realize high temperature quantum anomalous Hall effect. 

About the speaker: 
    Dr. Ke HE received BSc in 2000 from Department of Physics, Shandong University. He received Ph.D in 2006 from Institute of Physics, Chinese Academy of Sciences (IOPCAS). From 2006 to 2009, he was a postdoc research fellow in University of Tokyo. From 2009 to 2013, he was an associate scientist in IOPCAS. In 2013, he joined the Department of Physics, Tsinghua University, and became a professor in 2016. 
    Dr. Ke HE’s main research areas: topological quantum materials and effect, molecular beam epitaxy, surface, interface and low dimensional physics. 
    Dr. Ke HE presented 3 invited talks at the APS March Meetings, and received numerous rewards such as Lu Jia-Xi Prize of Chinese Academy of Sciences for Young Scientists (2011), National Award for Youth in Science and Technology (2013), Nishina Asia Award (2015), Yeh Chi-Sun Prize in Physics (2017), First Prize of State Natural Science Award, China (2018).