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PreprintarXiv licencearXiv

Binary magnetism and directional magnon transport in alkali-doped CrI3

  • Cihan Bacaksiz
  • Maarten Soenen
  • Denis Sabani
  • Rai Maciel de Menezes
  • Milorad V. Milosevic
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Abstract

The recent realization of two-dimensional (2D) magnets, with CrI3 as a pioneering example, has opened new avenues in the fields of 2D materials and magnetism. This breakthrough has been followed by extensive efforts to manipulate and exploit their magnetic properties. In this work, we investigate the adsorption of alkali-metal atoms as a route to control the magnetic behavior of monolayer CrI3. We show that, upon adsorption, alkali-metal atoms donate an electron to the CrI3 layer, leading to the formation of inequivalent Cr sites, with one Cr atom exhibiting an enhanced magnetic moment of 4 μB, while the other retains its typical 3 μB moment. These modifications significantly alter the magnetic exchange interactions, including the emergence of anisotropic exchange and Dzyaloshinskii--Moriya interactions (DMI). Consequently, the doped systems exhibit non-collinear magnetic ground states, modified temperature-dependent magnetism, and anisotropic spin-wave propagation, with a preferred propagation direction that becomes increasingly pronounced with increasing dopant size. Furthermore, an asymmetry between spin-wave propagation in opposite directions is observed, giving rise to a diode-like effect, particularly for heavier dopants. This behavior is attributed to the enhanced DMI, which breaks the symmetry of the magnon dispersion. These results demonstrate that alkali-metal doping provides an effective route to tune anisotropic and nonreciprocal magnonic properties in two-dimensional magnetic materials.

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Cite

BibTeXRIS
BibTeX
@misc{bacaksiz2026binary,
  title = {{Binary magnetism and directional magnon transport in alkali-doped CrI$_3$}},
  author = {Cihan Bacaksiz and Maarten Soenen and Denis Sabani and Rai Maciel de Menezes and Milorad V. Milosevic},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.31015},
  eprint = {2609.31015},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.31015},
}
RIS
TY  - UNPB
TI  - Binary magnetism and directional magnon transport in alkali-doped CrI_3
AU  - Cihan Bacaksiz
AU  - Maarten Soenen
AU  - Denis Sabani
AU  - Rai Maciel de Menezes
AU  - Milorad V. Milosevic
PY  - 2026
DA  - 2026/09/25
PB  - arXiv
DO  - 10.48550/arxiv.2609.31015
UR  - https://arxiv.org/abs/2609.31015
AB  - The recent realization of two-dimensional (2D) magnets, with CrI_3 as a pioneering example, has opened new avenues in the fields of 2D materials and magnetism. This breakthrough has been followed by extensive efforts to manipulate and exploit their magnetic properties. In this work, we investigate the adsorption of alkali-metal atoms as a route to control the magnetic behavior of monolayer CrI_3. We show that, upon adsorption, alkali-metal atoms donate an electron to the CrI_3 layer, leading to the formation of inequivalent Cr sites, with one Cr atom exhibiting an enhanced magnetic moment of 4 μ_B, while the other retains its typical 3 μ_B moment. These modifications significantly alter the magnetic exchange interactions, including the emergence of anisotropic exchange and Dzyaloshinskii--Moriya interactions (DMI). Consequently, the doped systems exhibit non-collinear magnetic ground states, modified temperature-dependent magnetism, and anisotropic spin-wave propagation, with a preferred propagation direction that becomes increasingly pronounced with increasing dopant size. Furthermore, an asymmetry between spin-wave propagation in opposite directions is observed, giving rise to a diode-like effect, particularly for heavier dopants. This behavior is attributed to the enhanced DMI, which breaks the symmetry of the magnon dispersion. These results demonstrate that alkali-metal doping provides an effective route to tune anisotropic and nonreciprocal magnonic properties in two-dimensional magnetic materials.
ER  -