Spin wave dispersion of the van der Waals antiferromagnet NiPS 3
R.D. Das (TU Delft - Applied Sciences, Kavli institute of nanoscience Delft)
R. den Teuling (TU Delft - Applied Sciences)
A.V. Bondarenko (TU Delft - Applied Sciences)
Elena V. Tartakovskaya (Adam Mickiewicz University, Kavli institute of nanoscience Delft)
Gerrit E.W. Bauer (Tohoku University, University of Chinese Academy of Sciences, Beijing)
Jaime Ferrer (Universidad de Oviedo)
Y.M. Blanter (Kavli institute of nanoscience Delft, TU Delft - Applied Sciences)
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Abstract
We calculate the magnon dispersion spectra of the two-dimensional zigzag van der Waals antiferromagnet NiPS3 for monolayer, bilayer, and bulk systems as a function of an external magnetic field. We compare the exchange and anisotropy constants of a spin model as calculated by first principles with those obtained experimentally. We can accurately explain the transition from a collinear to a canted ground state for a magnetic field applied normal to the (in-plane) easy-axis and a spin-flop transition when the field is parallel to it. A topologically protected Dirac nodal line is present and robust with respect to both external and anisotropy fields.