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Stacking-Dependent Interlayer Excitons in BP/CrSe2 van der Waals Heterostructure.

Nilesh Kumar1, Miroslav Kolos1, František Karlický1

  • 1Department of Physics, Faculty of Science, University of Ostrava, 30. dubna 22, 701 03 Ostrava, Czech Republic.

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|November 14, 2025
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Summary
This summary is machine-generated.

This study explores boron phosphide/chromium diselenide (BP/CrSe2) van der Waals heterostructures. Stacking order controls interlayer excitons, revealing potential for advanced optoelectronics and quantum technologies.

Keywords:
2D materialsexcitonsinterlayer interactionsoptical absorptionvan der Waals heterostructures

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Two-dimensional (2D) van der Waals (vdW) heterostructures offer tunable electronic and optical properties.
  • Exciton behavior in vdW heterostructures is crucial for optoelectronic applications.

Purpose of the Study:

  • To investigate the excitonic properties of boron phosphide/chromium diselenide (BP/CrSe2) vdW heterostructures.
  • To understand the influence of stacking order on interlayer excitons and their characteristics.

Main Methods:

  • Systematic many-body theoretical study.
  • Analysis of BP/CrSe2 vdW heterostructures with varying stacking configurations.

Main Results:

  • A robust type-II band alignment was observed across all stacking configurations.
  • Interlayer excitons were found to emerge selectively based on stacking order.
  • Strong exciton binding energies (0.34-0.44 eV) and nanosecond-scale room-temperature radiative lifetimes were determined.
  • Optical absorption spans the visible to near-infrared spectrum.

Conclusions:

  • Stacking-dependent interlayer coupling critically controls excitonic properties in vdW heterostructures.
  • The BP/CrSe2 heterostructure shows promise for next-generation light-harvesting and quantum technologies.
  • Tailored design strategies can leverage stacking order for specific optoelectronic functionalities.