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説明:

The ultrathin structure and efficient spin dynamics of two-dimensional (2D) antiferromagnetic (AFM) materials hold promising opportunities for ultrafast memory devices, artificial intelligence circuits, and advanced computing technology. For example, chromium thiophosphate (CrPS4) is one of the most promising 2D A-type AFM materials due to its robust stability in diverse environmental conditions and net out-of-plane magnetic moment in each layer, attributed to anisotropy in crystal axes (a and b). However, their net-zero magnetic moment poses a challenge for detecting the Néel state that is used to encode information. In this study, we demonstrate the detection of the Néel vector by detecting the magnetic order of the surface layer by employing localized defects in tungsten diselenide (WSe2). These defects are ideal candidates for optically active transducers to probe the magnetic order due to their narrow line width and high susceptibility to magnetic field (B-fields). We observed spin-polarized charge transfer in the heterostructure of bulk CrPS4 and single-layer WSe2, indicating type-II band alignment as supported by density functional theory (DFT) calculations. In the A-type AFM regime, the intensity of both right-handed and left-handed circularly polarized light emanating from the sample remains constant as a function of the applied B-field, indicating a constant polarized transition behavior. Our results demonstrate an approach to optically characterizing the magnetic states of 2D bulk AFM material by using both localized and delocalized defect excitons as a probe, highlighting avenues for future research and technological applications.

権利情報:

• In Copyright
  

  This document is the Accepted Manuscript version of a Published Article that appeared in final form in ACS Nano, copyright © 2025 American Chemical Society. To access the final published article, see https://doi.org/10.1021/acsnano.5c09258.

キーワード: Antiferromagnetic (AFM), WSe2, Density functional theory (DFT)

刊行年月日: 2025-10-21

出版者: American Chemical Society (ACS)

掲載誌:

• ACS Nano (ISSN: 1936086X) vol. 19 issue. 41 p. 36294-36301

研究助成金:

• Division of Chemistry 2203829
• Office of Integrative Activities OIA-2217786
• National Energy Research Scientific Computing Center ERCAP0034471
• Division of Materials Research DMR-2011824

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI:

公開URL: https://doi.org/10.1021/acsnano.5c09258

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更新時刻: 2026-07-29 10:43:07 +0900

MDRでの公開時刻: 2026-10-04 08:35:17 +0900