open access

https://hdl.handle.net/2115/92627

Hybrid skyrmion and antiskyrmion phases in polar C4v systems

英語

2024-02-01

American Physical Society (APS)

Physical Review B

109(5)

We investigate the stability of the skyrmion crystal phase in a tetragonal polar system with the DzyaloshinskiiMoriya interaction by focusing on the symmetry of ordering wave vectors forming the skyrmion crystal. Our analysis is based on numerical simulations for an effective spin model, which is derived from the weak-coupling regime in the Kondo lattice model on a polar square lattice. We show that a hybrid square skyrmion crystal consisting of Bloch and Neel spin textures emerges even under polar C4v symmetries when the ordering wave vectors correspond to low-symmetric wave vectors in momentum space, which is in contrast to the expectation from the Lifshitz invariants. We also show the instability toward the antiskyrmion crystal and rhombic skyrmion crystal depending on the direction of the Dzyaloshinskii-Moriya vector in momentum space. Furthermore, we show that the regions of the skyrmion crystal phases are affected by taking into account the symmetric anisotropic exchange interaction. Our results open the potential direction of engineering the hybrid skyrmion crystal and antiskyrmion crystal phases in polar magnets.

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