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Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
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Enhanced second-harmonic generation from WS2/ReSe2 heterostructure.

Kanchan Shaikh1, Taejun Yoo1, Zeyuan Zhu1

  • 1Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, USA.

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|March 9, 2026
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Summary
This summary is machine-generated.

Van der Waals heterostructures enable tunable nonlinear optics. Stacking WS2/ReSe2 layers reveals anisotropic second-harmonic generation (SHG) enhancement due to interlayer hybridization, not just band alignment.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nonlinear Optics

Background:

  • Van der Waals (vdW) stacking offers tunable nonlinear optical properties.
  • The precise role of interlayer interactions in vdW heterostructures on nonlinear optical susceptibilities is not fully understood.

Purpose of the Study:

  • Investigate anisotropic enhancement of second-harmonic generation (SHG) in WS2/ReSe2 heterobilayers with distinct crystal phases.
  • Determine the influence of interlayer interactions and band alignment on SHG response.

Main Methods:

  • Fabrication of WS2/ReSe2 heterobilayers.
  • Polarization-resolved second-harmonic generation (SHG) measurements.
  • Analysis of twist-angle dependence and spectral shifts.

Main Results:

  • Observed anisotropic enhancement of SHG, not solely explained by band alignment.
  • Evidence of band renormalization and interlayer hybridization from spectral shifts.
  • SHG suppression in certain orientations suggests intensity-borrowing mechanisms.

Conclusions:

  • Interlayer hybridization significantly modifies SHG anisotropy in vdW heterostructures.
  • Van der Waals stacking of distinct crystal phases allows tuning of nonlinear optical intensity and polarization dependence.