Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator

• DOI: 10.1126/science.1234414
• Publication Date: 2013-03-15T06:11:07Z
• Authors: Cui-Zu Chang; Jinsong Zhang; Xiao Feng; Jie Shen; Zuocheng Zhang; Minghua Guo; Kang Li; Yunbo Ou; Pang Wei; Li-Li Wang; Zhong-Qing Ji; Yang Feng; Shuaihua Ji; Xi Chen; Jinfeng Jia; Xi Dai; Zhong Fang; Shou-Cheng Zhang; Ke He; Yayu Wang; Li Lu; Xu-Cun Ma; Qi-Kun Xue
• Keywords: Topological insulator; Thermal Hall effect

The quantized version of the anomalous Hall effect has been predicted to occur in magnetic topological insulators, but experimental realization challenging. Here, we report observation quantum (QAH) thin films Cr-doped (Bi,Sb)2Te3, a insulator. At zero field, gate-tuned resistance reaches value h/e^2,accompanied by considerable drop longitudinal resistance. Under strong vanishes whereas remains at value. QAH may lead development low-power-consumption electronics.