Time：4:00pm, Wednesday, March 27, 2013

Venue：Conference Hall 104, Science Building, Tsinghua

Speaker：Prof. Yayu Wang (Tsinghua)

Title：Experimental observation of the quantum anomalous Hall effect in topological insulators

Abstract：

The anomalous Hall effect was discovered more than 130 years ago in ferromagnetic materials, in which a Hall resistance exists even in the

absence of external magnetic field. The quantized version of the anomalous Hall effect has attracted much interest since the discovery of

quantum Hall effect in the 1980s. A few years ago, it was proposed that quantum anomalous Hall effect may occur in magnetically doped

topological insulators, but the experimental realization has been elusive. In this talk we will report transport studies of topological insulator

thin films grown by molecular beam epitaxy. The main focus will be on the tuning of the electronic structure, magnetic ordering, and bulk band

topology, which led to the experimental realization of the quantum anomalous Hall effect, i.e., the quantum Hall effect in zero magnetic field.

Reference:

http://www.sciencemag.org/content/early/2013/03/13/science.1234414