论文标题
零场微型天际晶体和手性域状态在呼吸 - 抗抗铁磁铁中
Zero-field miniature skyrmion crystal and chiral domain state in breathing-kagome antiferromagnets
论文作者
论文摘要
理论上，在nimature单位电池中只有少量旋转的微型天空晶体晶体（SKX）的稳定性在理论上以$ j_1 $ - $ j_3 $ - $ j_3 $ antiferromagnets的呼吸kagome晶状体上的单个离子各种型号$ d $ d $ d $。通过蒙特卡洛模拟发现，由于呼吸债券抗化，零场三重-U {\ bf q} $微型SKX不仅可以在$ d = 0 $ [K。 Aoyama和H. Kawamura，物理。 Rev. B 105，L100407（2022）]，但在更普遍的情况下，具有易于轴（$ d <0 $）和Easy-Plane（$ d> 0 $）各向异性的各向异性分别是三重 - $ {\ bf q} $ collearear和nonnocoplanar国家。由于SKX和抗SKX具有正性或负性手性的分别是归化的，因此在零场上，替代符号的拓扑结构效应是可能的。还发现，反映手性退化，共线和共浮标相位的SKX相具有随机结构结构，由正 - 和负性手工簇组成。
The stability of a miniature skyrmion crystal (SkX) with only a small number of spins in the magnetic unit cell has been theoretically investigated in $J_1$-$J_3$ antiferromagnets on the breathing kagome lattice with a single-ion anisotropy $D$ at zero field. It is found by means of Monte Carlo simulations that due to the breathing bond-alternation, a zero-field triple-${\bf Q}$ miniature SkX can be stabilized not only in the specific case of $D=0$ [K. Aoyama and H. Kawamura, Phys. Rev. B 105, L100407 (2022)] but also in more general situations with easy-axis ($D<0$) and easy-plane ($D>0$) anisotropies which favor triple-${\bf Q}$ collinear and noncoplanar states, respectively. Since the SkX and anti-SkX each having positive or negative chirality are energetically degenerate, the topological Hall effect of alternative sign is possible at zero field. It is also found that reflecting the chiral degeneracy, the collinear and coplanar phases preempting the SkX phase possess random domain structures consisting of positive- and negative-chirality clusters.
