三角晶格上非中心对称巡游磁体中的meron-antieron晶体
Meron-antimeron crystals in noncentrosymmetric itinerant magnets on a triangular lattice
摘要：
多个$Q$磁态经常会诱导出非平凡的拓扑自旋织构，如skyrmion和hedgehog。我们从理论上研究了另一种具有拓扑缺陷的多重$Q$态，一种重子-反重子晶体（MAX），由半整数Skyrmion数的重子和反重子的周期阵列表示。对三角形晶格上的非中心对称巡游磁体的有效自旋模型进行模拟退火，我们发现矩形和三角形MAX是由自旋-电荷耦合产生的双二次相互作用和自旋-轨道耦合产生的Dzyaloshinskiii-Moriya相互作用之间的相互作用稳定的。我们还讨论了磁场对三角形MAX的影响，发现三角形MAX对磁场方向具有高度的各向异性响应，特别是当磁场沿$y$和$z$方向时，三角形MAX转变为Skyrmion晶体，而当磁场沿$x$方向时，三角形MAX被另一个手征态所取代.这些结果将激发进一步的实验研究巡游磁铁中的MAX。
英文摘要：
Multiple-$Q$ magnetic states often induce nontrivial topological spin textures, such as a skyrmion and a hedgehog. We theoretically investigate yet another multiple-$Q$ state with topological defects, a meron-antimeron crystal (MAX), represented by a periodic array of the meron and antimeron with a half-integer skyrmion number. Performing simulated annealing for an effective spin model of noncentrosymmetric itinerant magnets on a triangular lattice, we show that rectangular-shaped and triangular-shaped MAXs are stabilized by the interplay between the biquadratic interaction arising from the spin-charge coupling and the Dzyaloshinskii-Moriya interaction arising from the spin-orbit coupling. We also discuss the effect of a magnetic field on the triangular MAX, where highly anisotropic responses against a field direction are found. In particular, we show that the triangular MAX turns into the skyrmion crystal for the fields along the $y$ and $z$ directions, while it is replaced by another chiral state for the field along the $x$ direction. These results would inspire further experimental investigation of the MAXs in itinerant magnets.
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