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Thermal conduction in single-layer black phosphorus: highly anisotropic?

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Single-layer black phosphorus exhibits weak thermal conduction anisotropy, with differences below 4% between in-plane directions. This arises from competing phonon behaviors influenced by its puckered structure and anisotropic Poisson

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Single-layer black phosphorus (SLBP) possesses a puckered structure, leading to anisotropic optical, electronic, and mechanical properties.
  • Understanding thermal transport in SLBP is crucial for its application in nanoscale electronic devices.

Purpose of the Study:

  • To investigate the thermal conductance of SLBP in the ballistic transport regime.
  • To quantify the anisotropy of thermal conduction in SLBP.

Main Methods:

  • Utilized the non-equilibrium Green's function (NEGF) approach.
  • Employed first-principles calculations.
  • Analyzed phonon group velocities and transport properties.

Main Results:

  • Observed very weak anisotropy in thermal conduction, with differences between in-plane directions less than 4%.
  • Identified that out-of-plane acoustic phonon branches have lower group velocities perpendicular to the puckering direction.
  • Found abnormal behavior in the longitudinal acoustic phonon branch with higher group velocities in the perpendicular direction, linked to anisotropic Poisson's ratio.

Conclusions:

  • The weak thermal anisotropy in SLBP results from the interplay between out-of-plane and in-plane phonon modes.
  • The puckered structure and anisotropic Poisson's ratio significantly influence thermal transport characteristics.
  • SLBP demonstrates potential for thermal management in nanoscale applications due to its tunable thermal properties.