Scale-invariant quantum anomalous Hall effect in magnetic topological insulators beyond the two-dimensional limit.

@article{Kou2014ScaleinvariantQA,
  title={Scale-invariant quantum anomalous Hall effect in magnetic topological insulators beyond the two-dimensional limit.},
  author={Xufeng Kou and Shih-Ting Guo and Yabin Fan and Lei Pan and Murong Lang and Ying Jiang and Qiming Shao and Tianxiao Nie and Koichi Murata and Jianshi Tang and Yong Wang and Liang He and Ting-Kuo Lee and Wei-Li Lee and Kang L. Wang},
  journal={Physical review letters},
  year={2014},
  volume={113 13},
  pages={
          137201
        }
}
We investigate the quantum anomalous Hall effect (QAHE) and related chiral transport in the millimeter-size (Cr(0.12)Bi(0.26)Sb(0.62))₂Te₃ films. With high sample quality and robust magnetism at low temperatures, the quantized Hall conductance of e²/h is found to persist even when the film thickness is beyond the two-dimensional (2D) hybridization limit. Meanwhile, the Chern insulator-featured chiral edge conduction is manifested by the nonlocal transport measurements. In contrast to the 2D… Expand
Thickness-Driven Quantum Anomalous Hall Phase Transition in Magnetic Topological Insulator Thin Films
The quantized version of anomalous Hall effect realized in magnetic topological insulators (MTIs) has great potential for the development of topological quantum physics and low-powerExpand
Metal-to-insulator switching in quantum anomalous Hall states
TLDR
The experimental observation of the giant longitudinal resistance peak and zero Hall conductance plateau at the coercive field in the six quintuple-layer (Cr0.12Bi0.26Sb0.62)2Te3 film is reported and the universal QAHE phase diagram is confirmed through the angle-dependent measurements. Expand
Geometric effect on quantum anomalous Hall states in magnetic topological insulators.
TLDR
It is found that, in clean samples, the geometric mismatch between the detecting electrodes and the MTI sample leads to additional scattering in the central Hall bar, which is similar to the effect of splitting gates in the traditional Hall effect. Expand
Quantum anomalous Hall effect in time-reversal-symmetry breaking topological insulators.
  • Cui-Zu Chang, Mingda Li
  • Physics, Medicine
  • Journal of physics. Condensed matter : an Institute of Physics journal
  • 2016
TLDR
The quantum anomalous Hall effect (QAHE), the last member of Hall family, was predicted to exhibit quantized Hall conductivity σ(yx) = e2/h without any external magnetic field and has been experimentally observed in thin films of the time-reversal symmetry breaking ferromagnetic topological insulators (TI), Cr- and V- doped (Bi,Sb)2Te3. Expand
Magnetic modulation doping in topological insulators toward higher-temperature quantum anomalous Hall effect
Quantum anomalous Hall effect (QAHE), which generates dissipation-less edge current without external magnetic field, is observed in magnetic-ion doped topological insulators (TIs), such as Cr- andExpand
High-Temperature Quantum Anomalous Hall Effect in n-p Codoped Topological Insulators.
TLDR
A novel kinetic pathway to realize the quantum anomalous Hall effect at high temperatures by n-p codoping of three-dimensional topological insulators is presented and, strikingly, the system exhibits a quantized Hall conductance, the telltale hallmark of QAHE, at temperatures of at least ∼50  K, which is 3 orders of magnitude higher than the typical temperatures at which it has been realized to date. Expand
High-precision realization of robust quantum anomalous Hall state in a hard ferromagnetic topological insulator.
TLDR
The experimental observation of the QAH state in V-doped (Bi,Sb)2Te3 films with the zero-field longitudinal resistance down to 0.00013 ± 0.00007h/e(2) is reported, a major step towards dissipationless electronic applications in the absence of external fields. Expand
Enhancing the Quantum Anomalous Hall Effect by Magnetic Codoping in a Topological Insulator.
TLDR
By codoping Cr and V magnetic elements in (Bi,Sb)2 Te3 TI, the temperature of the QAH effect can be significantly increased such that full quantization is achieved at 300 mK and zero-field Hall resistance of 0.97 h/e2 is observed at 1.5 K. Expand
Quantum anomalous Hall effect in magnetic topological insulators
  • Q. Xue, K. He, Yayu Wang
  • Physics
  • 2016 IEEE 29th International Conference on Micro Electro Mechanical Systems (MEMS)
  • 2016
Summary form only given. The quantum Hall effect, a quantum phenomenon that appears in macroscopic length scale, is one of the most important topics in condensed matter physics, is. It has long beenExpand
High-temperature quantum anomalous Hall insulator in two-dimensional Bi2ON
Chiral edge states in quantum anomalous Hall (QAH) insulators can conduct dissipationless charge current, which has attracted extensive attention recently. One major obstacle for realisticExpand
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