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Related Concept Videos

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The Hall Effect

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Edwin H. Hall, in the year 1879, devised an experiment that could be used to identify the polarity of the predominant charge carriers in a conducting material. From a historical perspective, this experiment was the first to demonstrate that the charge carriers in most metals are negative.
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Quantum Anomalous Hall Effect in Ferromagnetic Metals.

Yu-Hao Wan1, Peng-Yi Liu1, Qing-Feng Sun1,2

  • 1Peking University, International Center for Quantum Materials and School of Physics, Beijing 100871, China.

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This study demonstrates the quantum anomalous Hall (QAH) effect in metallic systems, not just insulators. This finding expands the possibilities for QAH effect realization in novel electronic materials.

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Area of Science:

  • Condensed Matter Physics
  • Topological Physics

Background:

  • The quantum anomalous Hall (QAH) effect is crucial for topological physics and electronics.
  • Traditionally, the QAH effect has been exclusively observed in insulating materials.

Purpose of the Study:

  • To theoretically investigate the possibility of realizing the QAH effect in metallic systems.
  • To characterize a novel QAH phase distinct from the conventional insulating phase.

Main Methods:

  • Theoretical modeling of a six-terminal Hall bar.
  • Analysis of bulk and edge channel behavior.
  • Investigation of conductivity under dephasing and disorder.

Main Results:

  • Demonstrated QAH effect in metallic systems, characterized by chiral edge and isotropic bulk channels without a bulk gap.
  • Quantized Hall conductivity and nonzero longitudinal conductivity observed due to dephasing.
  • Quantized Hall conductivity shows significant robustness against disorder.

Conclusions:

  • The QAH effect can be realized in metals, broadening the material scope beyond insulators.
  • This research offers insights for achieving the QAH effect at higher temperatures.