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Moiré Engineering of Interlayer Coupling in WS2/MoS2 Monolayers.

Linglong Zhang1,2, Masab Rafique1, Jian Kang1

  • 1College of Physics, Nanjing University of Aeronautics and Astronautics, Key Laboratory of Aerospace Information Materials and Physics (NUAA), MIIT, Nanjing 211106, China.

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Summary

Researchers dynamically controlled moiré potentials in WS2/MoS2 heterobilayers by adjusting excitation power and gate voltage. This tuning influences interlayer couplings, crucial for developing advanced optoelectronic devices.

Keywords:
Interlayer couplingelectrical controlmoiré potentialmoiré superlatticestwist angle

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Moiré superlattices offer tunable electronic band structures and material properties via interlayer couplings.
  • These superlattices show promise for optoelectronic applications like color tuning and light harvesting.
  • Experimental control over moiré potentials in heterostructures remains a significant challenge.

Purpose of the Study:

  • To systematically investigate the dynamic modification of interlayer couplings in WS2/MoS2 heterobilayers.
  • To explore the influence of excitation power and gate voltage on moiré potentials.
  • To demonstrate experimental control over moiré potentials for optoelectronic device applications.

Main Methods:

  • Systematic modification of interlayer couplings in WS2/MoS2 heterobilayers.
  • Adjustment of excitation power and gate voltage to control moiré potentials.
  • Photoluminescence (PL) measurements at varying gate voltages and excitation powers.
  • Theoretical simulations to verify experimental observations.

Main Results:

  • Increasing excitation power reduces effective moiré potentials by altering moiré trap filling.
  • Reduced moiré potentials suppress interlayer charge transfer and p-doping effects.
  • Power-dependent PL measurements showed a decreased sublinear slope with increasing gate voltage (0.63 to 0.52), indicating enhanced moiré localization.
  • Theoretical simulations confirmed the gate-tuned control over moiré potentials.

Conclusions:

  • Excitation power and gate voltage are effective means to dynamically tune moiré potentials in WS2/MoS2 heterobilayers.
  • This control over interlayer couplings is essential for designing next-generation optoelectronic devices.
  • The findings provide a pathway for experimental realization of tunable moiré superlattices.