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Strong polaronic effect in a superatomic two-dimensional semiconductor.

Qiuyang Li1, Fang Liu1, Jake C Russell1

  • 1Department of Chemistry, Columbia University, New York, New York 10027, USA.

The Journal of Chemical Physics
|May 10, 2020
PubMed
Summary
This summary is machine-generated.

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Superatomic crystalline solids like Re6Se8Cl2 exhibit temperature-dependent electronic properties. Researchers observed significant polaronic effects influencing carrier behavior in this semiconductor material.

Area of Science:

  • Solid-state physics
  • Materials science
  • Superconductivity

Background:

  • Crystalline solids from superatomic building blocks offer tunable properties.
  • Rhenium hexaselenide chloride (Re6Se8Cl2) is a layered van der Waals material.
  • It's an indirect gap semiconductor that can superconduct when doped.

Purpose of the Study:

  • Investigate the temperature dependence of the valence band edge (VBE) in Re6Se8Cl2.
  • Understand how carrier properties are affected by phonon coupling in this material.

Main Methods:

  • Angle-resolved photoemission spectroscopy (ARPES) was used.
  • Probed the valence band edge (VBE) of Re6Se8Cl2.

Main Results:

  • Valence band edge (VBE) dispersion strongly depends on temperature.

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  • Bandwidth decreased by an order of magnitude from 120 ± 30 meV at 70 K to ~10 ± 20 meV at 300 K.
  • Observed behavior is consistent with dominant polaronic effects.

    • Conclusions:

    • Polaronic effects significantly influence carrier properties in Re6Se8Cl2.
    • The findings align with the Holstein polaron model for molecular solids.