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Charge carriers in twisted MoSe2/WSe2 heterobilayers surf thermally excited phason waves. This "carrier surfing" phenomenon, driven by moiré lattice motion, impacts exciton transport device design.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Twisted transition metal dichalcogenide heterobilayers exhibit unique electronic and optical properties due to moiré potentials.
  • Understanding the influence of thermal effects on these moiré systems is crucial for device applications.

Purpose of the Study:

  • To investigate the impact of thermal fluctuations on the atomic and electronic structure of twisted MoSe2/WSe2 heterobilayers.
  • To elucidate the mechanism of charge carrier motion in response to thermal excitations within the moiré lattice.

Main Methods:

  • Combined classical molecular dynamics (MD) simulations and ab initio density functional theory (DFT) calculations.
  • Analysis of moiré lattice dynamics and charge carrier localization under thermal stress.

Main Results:

  • Thermally excited phason modes induce rigid motion of the moiré lattice.
  • Low-energy electrons and holes localize in specific stacking regions and follow the moiré lattice's thermal motion.
  • Charge carriers effectively 'surf' on thermally excited phason waves.

Conclusions:

  • Thermal fluctuations significantly influence charge carrier behavior in twisted heterobilayers.
  • The observed 'carrier surfing' phenomenon persists even with substrates or frozen potentials.
  • This finding has potential implications for designing advanced charge and exciton transport devices utilizing moiré materials.