From magnetically doped topological insulator to the quantum anomalous Hall effect

doi:10.1088/1674-1056/22/6/067305

Abstract Quantum Hall effect (QHE), as a class of quantum phenomena that occur in macroscopic scale, is one of the most important topics in condensed matter physics. It has long been expected that QHE may occur without Landau levels so that neither external magnetic field nor high sample mobility is required for its study and application. Such a QHE free of Landau levels, can appear in topological insulators (TIs) with ferromagnetism as the quantized version of the anomalous Hall effect, i.e., quantum anomalous Hall (QAH) effect. Here we review our recent work on experimental realization of the QAH effect in magnetically doped TIs. With molecular beam epitaxy, we prepare thin films of Cr-doped (Bi,Sb)₂Te₃ TIs with wellcontrolled chemical potential and long-range ferromagnetic order that can survive the insulating phase. In such thin films, we eventually observed the quantization of the Hall resistance at h/e² at zero field, accompanied by a considerable drop in the longitudinal resistance. Under a strong magnetic field, the longitudinal resistance vanishes, whereas the Hall resistance remains at the quantized value. The realization of the QAH effect provides a foundation for many other novel quantum phenomena predicted in TIs, and opens a route to practical applications of quantum Hall physics in low-power-consumption electronics.

Keywords: topological insulator quantum anomalous Hall effect quantum Hall effect ferromagnetic insulator molecular beam epitaxy

Received: 16 May 2013
Accepted manuscript online:

PACS:	73.21.Fg	(Quantum wells)
	73.43.-f	(Quantum Hall effects)
	75.50.Pp	(Magnetic semiconductors)
	75.70.-i	(Magnetic properties of thin films, surfaces, and interfaces)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11174343 and 11134008), the National Basic Research Program of China (Grant Nos. 2013CB921702 and 2009CB929400), and the Knowledge Innovation Program of the Chinese Academy of Sciences.

Corresponding Authors: Wang Ya-Yu, Xue Qi-Kun
E-mail: kehe@iphy.ac.cn; yayuwang@mail.tsinghua.edu.cn; qkxue@mail.tsinghua.edu.cn

Cite this article:

He Ke (何珂), Ma Xu-Cun (马旭村), Chen Xi (陈曦), Lü Li (吕力), Wang Ya-Yu (王亚愚), Xue Qi-Kun (薛其坤) From magnetically doped topological insulator to the quantum anomalous Hall effect 2013 Chin. Phys. B 22 067305

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From magnetically doped topological insulator to the quantum anomalous Hall effect

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