Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator
By Cui-Zu Chang, Jinsong Zhang, Xiao Feng, Jie Shen, Zuocheng Zhang, Minghua Guo, Kang Li, Y. Ou, P. Wei, Lili Wang and 13 more. Science, 2013
3,429 citations recorded by the source corpus.
Quantized and Anomalous The Hall effect, an electromagnetic phenomenon with a straightforward explanation, has many exotic counterparts, including a quantized version occurring independently of the presence of external magnetic fields. Inspired by a theoretical prediction of the quantum anomalous Hall (QAH) effect in magnetically doped topological insulator thin films, Chang et al. (p. 167, published online 14 March; see the Perspective by Oh) prepared thin films of the compound Cr0.15(Bi0.1Sb0.9)1.85Te3, with Cr as the magnetic dopant. They observed a plateau in the Hall resistance as a function of the gating voltage without any applied magnetic fields, signifying the achievement of the QAH state. An elusive effect emerges in thin films of a bismuth-antimony-telluride topological insulator doped with magnetic chromium. [Also see Perspective by Oh] The quantized version of the anomalous Hall effect has been predicted to occur in magnetic topological insulators, but the experimental realization has been challenging. Here, we report the observation of the quantum anomalous Hall (QAH) effect in thin films of chromium-doped (Bi,Sb)2Te3, a magnetic topological insulator. At zero magnetic field, the gate-tuned anomalous Hall resistance reaches the predicted quantized value of h/e2, 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 may lead to the development of low-power-consumption electronics.
Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/688a57efe8dd235ea11843193c50ec60de4793ec
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In Atomic and Molecular Physics, and Optics
- Nathan Goldman
- D. Vanderbilt
- Hsin Lin
- Arun Bansil
- Ashvin Vishwanath
- Tanmoy Das
- Bogdan Andrei Bernevig
- Liang Fu
In Materials Chemistry
- Hsin Lin
- Arun Bansil
- Tanmoy Das
- Bogdan Andrei Bernevig
- Liang Fu
- D. Vanderbilt
- Allan H. MacDonald
- Alexey A. Soluyanov
Citations in the corpus
- Skyrmions in magnetic multilayers (2017, background): “anomalous Hall effect [79], quantum Hall effect [233], spin Hall effect [12, 13, 177] and quantum anomalous Hall effect [234].”
- Gapless Surface Dirac Cone in Antiferromagnetic Topological Insulator MnBi2Te4 (2019, background): “The QAH insulator was first discovered in a magnetically doped topological insulator (TI) at an ultralow temperature of 30 mK [9].”
- Probing and controlling magnetic states in 2D layered magnetic materials (2019, neutral): “The interesting case of dilute magnetic layered topological insulators 42 will not be discussed in this Review owing to space limitations.”
- Dirac Surface States in Intrinsic Magnetic Topological Insulators EuSn2As2 and MnBi2nTe3n+1 (2019, background): “The quantum anomalous Hall effect has been first realized in magnetically doped (Bi,Sb)2Te3 thin films [9,10].”
- Trajectory of the anomalous Hall effect towards the quantized state in a ferromagnetic topological insulator (2014, background): “These results are similar to those previously reported [9], though here a larger B is required to suppress Rxx as well as TC and HC discussed above.”
- Colloquium : Topological band theory (2016, background): “Another interesting effect first predicted theoretically in Bi2Se3, Bi2Se3 and Sb2Te3 films doped with Cr and Fe is the quantum anomalous Hall effect (Yu et al. 2010), which has been observed in thin films of Cr-doped (Bi,Sb)2Te3(Chang et al. 2013).”