Thickness Dependence of the Quantum Anomalous Hall Effect in Magnetic Topological Insulator Films

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• 作者：Xiao Feng ; Yang Feng ; Jing Wang ; Yunbo Ou ; Zhenqi Hao ; Chang Liu ; Zuocheng Zhang ; Liguo Zhang ; Chaojing Lin ; Jian Liao ; Yongqing Li ; Li-Li Wang ; Shuai-Hua Ji ; Xi Chen ; Xucun Ma ; Shou-Cheng Zhang ; Yayu Wang ; Ke He and Qi-Kun Xue
• 刊名：Advanced Materials
• 出版年：2016
• 出版时间：August 10, 2016
• 年：2016
• 卷：28
• 期：30
• 页码：6386-6390
• 全文大小：994K
• ISSN：1521-4095

文摘

The evolution of the quantum anomalous Hall effect with the thickness of Cr-doped (Bi,Sb)₂Te₃ magnetic topological insulator films is studied, revealing how the effect is caused by the interplay of the surface states, band-bending, and ferromagnetic exchange energy. Homogeneity in ferromagnetism is found to be the key to high-temperature quantum anomalous Hall material.