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Quantum Hall effect in black phosphorus two-dimensional electron system.

Likai Li1,2, Fangyuan Yang1,2, Guo Jun Ye2,3,4

  • 1State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China.

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|March 29, 2016
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This summary is machine-generated.

Researchers observed the integer quantum Hall effect in high-quality black phosphorus, a novel two-dimensional electron system (2DES). This breakthrough, enabled by advanced van der Waals heterostructures, paves the way for new quantum transport studies and device applications.

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Area of Science:

  • Condensed-matter physics
  • Materials science
  • Quantum electronics

Background:

  • Two-dimensional electron systems (2DESs) are crucial for condensed-matter research.
  • Black phosphorus has recently emerged as a promising 2D material for 2DES applications.

Purpose of the Study:

  • To investigate the quantum Hall effect in black phosphorus 2DES.
  • To achieve ultrahigh carrier mobility in black phosphorus devices.

Main Methods:

  • Fabrication of black phosphorus 2DES within a van der Waals heterostructure.
  • Integration with a graphite back gate for impurity potential screening.
  • Measurement of quantum transport properties at low temperatures.

Main Results:

  • Observation of the integer quantum Hall effect in black phosphorus 2DES.
  • Achieved a carrier Hall mobility of 6,000 cm(2) V(-1) s(-1).
  • Gained insights into the energetics of spin-split Landau levels.

Conclusions:

  • High-quality black phosphorus 2DES can exhibit the quantum Hall effect.
  • Van der Waals heterostructures with graphite gates are effective for enhancing mobility.
  • The findings open avenues for exploring quantum transport and device applications in ultrahigh mobility black phosphorus systems.