Exchange field-induced topological phase transition in ultrathin films of three-dimension topological insulators
National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University Nanjing 210093, China
Received: 30 June 2012
Accepted: 5 October 2012
We investigate the topological phase transition in ultrathin films of three-dimension topological insulators, induced by a rotation of the exchange field. It is found that, as the exchange field rotates from the vertical to the horizontal orientation, there is a topological phase transition from a quantum anomalous Hall phase to the trivial insulating one at a critical angle, yielding an angular-dependent quantum magnetoresistance.
PACS: 73.43.-f – Quantum Hall effects / 73.50.-h – Electronic transport phenomena in thin films / 71.70.Ej – Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect
© EPLA, 2012