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Magnetic Proximity Coupling to Defects in a Two-Dimensional Semiconductor.

Muhammad Hassan Shaikh1, Matthew P Whalen2, Dai Q Ho3,4

  • 1Department of Physics, University of Delaware, Newark, Delaware 19716, United States.

ACS Nano
|October 4, 2025
PubMed
Summary
This summary is machine-generated.

Researchers detected the Néel vector in two-dimensional (2D) antiferromagnetic (AFM) chromium thiophosphate (CrPS4) using localized defects in tungsten diselenide (WSe2). This optical method enables characterization of AFM magnetic states for advanced computing.

Keywords:
CrPS4WSe2defects in semiconductorsmagnetic proximity effectspin-polarized charge transfertwo-dimensional magnettype-II band alignment

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Two-dimensional (2D) antiferromagnetic (AFM) materials offer potential for advanced electronic devices due to their spin dynamics.
  • Chromium thiophosphate (CrPS4) is a stable 2D A-type AFM material with potential for information encoding.
  • Detecting the Néel state in AFM materials is challenging due to their net-zero magnetic moment.

Purpose of the Study:

  • To demonstrate a method for detecting the Néel vector in 2D AFM materials.
  • To utilize localized defects in tungsten diselenide (WSe2) as optical transducers for probing magnetic order.
  • To investigate the spin-polarized charge transfer and band alignment in CrPS4/WSe2 heterostructures.

Main Methods:

  • Fabrication of heterostructures using bulk CrPS4 and single-layer WSe2.
  • Optical characterization employing circularly polarized light.
  • Density functional theory (DFT) calculations to determine band alignment.
  • Application of magnetic fields (B-fields) to probe magnetic order.

Main Results:

  • Observed spin-polarized charge transfer in the CrPS4/WSe2 heterostructure, consistent with type-II band alignment.
  • Demonstrated that localized defects in WSe2 act as effective optical probes for AFM magnetic order.
  • Showcased constant polarized transition behavior in the A-type AFM regime regardless of applied B-field.

Conclusions:

  • Developed an optical approach for characterizing magnetic states in 2D AFM materials using defect excitons.
  • Highlighted the potential of CrPS4 and WSe2 heterostructures for future spintronic and computing applications.
  • Opened avenues for further research into optically probing and manipulating AFM states.