Giant Zeeman Splitting for Monolayer Nanosheets at Room Temperature

Chi Li, Sheng Chih Hsu, Jun Xiao Lin, Jou Yun Chen, Kai Chun Chuang, Yuan Pin Chang, Hua Shu Hsu, Ching Hsiang Chen, Tien Sung Lin, Yi Hsin Liu

Research output: Contribution to journalArticlepeer-review

Abstract

Giant Zeeman splitting and zero-field splitting (ZFS) are observed in 2D nanosheets that have monolayers of atomic thickness. In this study, single-crystalline CdSe(ethylenediamine)0.5 and Mn2+-doped nanosheets are synthesized via a solvothermal process. Tunable amounts of Mn2+(0.5-8.0%) are introduced, resulting in lattice contraction as well as phosphorescence from five unpaired electrons. The exciton dynamics are dominated by spin-related electronic transitions (4T1 → 6A1) with long lifetimes (20.5, 132, and 295 μs). Temperature-varied EPR spectroscopy with spectral simulation reveals large ZFS (D = 3850 MHz) due to axial distortion of substituted Mn2+ (S = 5/2). In the magnetic circular dichroism (MCD) measurements, we observed giant Zeeman splitting with large effective g values (up to 231 ± 21), which implies huge sp-d exchange interactions in 2D monolayer regimes, leading to diluted magnetic semiconductor (DMS) materials.

Original languageEnglish
Pages (from-to)20616-20623
Number of pages8
JournalJournal of the American Chemical Society
Volume142
Issue number49
DOIs
Publication statusPublished - 2020 Dec 9

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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