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Ferroelectric Control of Interlayer Excitons in 3R-MoS2/MoSe2 Heterostructures.

Johannes Schwandt-Krause1, Mohammed El Amine Miloudi1, Elena Blundo2,3

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|December 21, 2025
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Summary
This summary is machine-generated.

Interlayer excitons in 3R-MoS2/MoSe2 heterostructures interact with ferroelectric domains. This interaction allows for tuning exciton energy via electrical control, paving the way for novel optoelectronic devices.

Keywords:
interlayer excitonsoptical spectroscopysliding ferroelectricityvan der Waals heterostructures

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Optics

Background:

  • Van der Waals heterostructures offer unique electronic and optical properties.
  • Ferroelectric materials exhibit spontaneous electric polarization, switchable by an external electric field.
  • Interlayer excitons, bound electron-hole pairs in heterostructures, are sensitive to their environment.

Purpose of the Study:

  • To investigate the interplay between interlayer excitons and ferroelectric domains in hBN-encapsulated 3R-MoS2/MoSe2 heterostructures.
  • To understand how ferroelectric domain polarization affects interlayer exciton energies.
  • To explore the electrical tunability of interlayer excitons through ferroelectric domain switching.

Main Methods:

  • Low-temperature photoluminescence spectroscopy.
  • Density functional theory (DFT) calculations.
  • Many-body Green's function calculations.
  • Gate voltage modulation experiments.

Main Results:

  • A significant redshift in interlayer exciton energy was observed with increasing MoS2 layer thickness, attributed to band renormalization and dielectric effects.
  • Local variations in exciton energy were found to correlate with the ferroelectric domain polarization of the 3R-MoS2 layer, showing distinct domain-dependent transition energies.
  • Electrical tuning of interlayer exciton energy was achieved by electrically switching ferroelectric domains.

Conclusions:

  • The study demonstrates a strong coupling between interlayer excitons and ferroelectric domains in 3R-MoS2/MoSe2 heterostructures.
  • Local ferroelectric order provides a mechanism for controlling interlayer exciton properties.
  • These findings lay the groundwork for developing advanced ferroelectric optoelectronic devices utilizing van der Waals heterostructures.