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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Optoelectronics

Background:

  • Few-layer transition metal dichalcogenides (TMDCs) are 2D materials with intrinsic band gaps around 2 eV.
  • Reduced screening in 2D materials leads to rich excitonic physics and optoelectronic applications.

Purpose of the Study:

  • To investigate the effect of a perpendicular electric field on inter-layer excitons in bilayer TMDCs.
  • To understand the anomalous binding energy behavior of these excitons.

Main Methods:

  • Applying a layer-perpendicular electric field to control the band gap size.
  • Analyzing the screening and charge depletion effects in bilayer TMDCs.

Main Results:

  • An anomalous inter-layer exciton was generated with binding energy independent of the band gap size.
  • This phenomenon arises from competing intra-layer screening increase and inter-layer screening decrease due to gating.

Conclusions:

  • The constant binding energy is an exception to the universal trend of decreasing binding energy with increasing band gap.
  • This offers unprecedented control over inter-layer excitons in TMDCs, surpassing control over intra-layer counterparts.