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Pressure-Induced Electronic Transition in Black Phosphorus.

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Under moderate hydrostatic pressure, black phosphorus transitions into a semimetal, exhibiting colossal magnetoresistance and Dirac-like electronic dispersion. This discovery opens new avenues for exploring novel electronic states in this material.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • Semimetals feature both electrons and holes at the Fermi level, leading to unique electronic properties due to band overlaps.
  • Black phosphorus, an elemental semiconductor, possesses tunable electronic properties.

Purpose of the Study:

  • To investigate the electronic topological transition of black phosphorus under hydrostatic pressure.
  • To characterize the electronic properties of black phosphorus in its pressure-induced semimetallic phase.

Main Methods:

  • Applying moderate hydrostatic pressure to black phosphorus.
  • Measuring magnetoresistance and Hall resistivity.
  • Analyzing Shubnikov-de Haas oscillations.

Main Results:

  • An electronic topological transition occurred at approximately 1.2 GPa, transforming black phosphorus into a semimetal.
  • The semimetallic phase exhibited colossal positive magnetoresistance and nonlinear Hall resistivity.
  • Shubnikov-de Haas oscillations revealed a complex Fermi surface topology and a nontrivial Berry phase, indicating Dirac-like dispersion.

Conclusions:

  • Hydrostatic pressure effectively tunes black phosphorus into a semimetal.
  • The semimetallic phase presents exotic electronic phenomena, including colossal magnetoresistance and Dirac-like electronic states.
  • This work expands the understanding of black phosphorus and facilitates research into novel electronic states.