论文标题
沮丧的三角形晶格中的自发性抗铁磁气旋/反震颤晶格和螺旋旋转液态
Spontaneous antiferromagnetic skyrmion/antiskyrmion lattice and spiral spin liquid states in the frustrated triangular lattice
论文作者
论文摘要
磁性天际是由于其尺寸较小，稳定性和通过电流易于操作而引起的数据存储应用非常感兴趣的拓扑准颗粒。抗铁磁（AF）Skyrmions具有新的特征和巨大的好处（超小的天空尺寸，没有横向偏转和有效的操纵），最近已成为强烈焦点的主题。在这里，我们表明，自发的反铁磁性Skyrmion/Antiskyrmion Grattice（AF-SKL/Askl）在磁性领域的三角形驻留物上出现在经典的Heisenberg Antiferromagnet中，仅在交易所互动下，只需将最高第三个邻居交换（$ J_1 $ -J_1 $ -J_1 $ j__ $ j_2 $ - $ j_2 $ - $ j_2 $）。 By means of the Luttinger-Tisza approximation and large scale Monte-Carlo simulations (combining Parallel-Tempering and overrelaxation with the Metropolis algorithm), we present a rich $J_2$-$J_3$ magnetic phase diagram including exotic multiple-q phases, degenerate states and a spontaneous AF-SkL/ASkL lattice at intermediate magnetic fields.此外，我们表明，在零磁场上，在中等温度下出现了带环状退化的外来自旋液态，这些液态通过选择不同的多重Q状态的热波动而破裂。这些发现极大地丰富了中心对称材料或晶格中的抗磁磁性天际的研究，包括相对较弱的Dzyaloshinskii-Moriya相互作用。
Magnetic skyrmions are topological quasiparticles of great interest for data storage applications because of their small size, high stability, and ease of manipulation via electric current. Antiferromagnetic (AF) skyrmions, with new features and huge benefits (ultra-small skyrmion sizes, no transverse deflection and efficient manipulation), have recently become the subject of intense focus. Here we show that a spontaneous antiferromagnetic skyrmion/antiskyrmion lattice (AF-SkL/ASkL) emerges in the classical Heisenberg antiferromagnet on the triangular-lattice under magnetic fields, taking only exchange interactions up to third nearest neighbors ($J_1$-$J_2$-$J_3$). By means of the Luttinger-Tisza approximation and large scale Monte-Carlo simulations (combining Parallel-Tempering and overrelaxation with the Metropolis algorithm), we present a rich $J_2$-$J_3$ magnetic phase diagram including exotic multiple-q phases, degenerate states and a spontaneous AF-SkL/ASkL lattice at intermediate magnetic fields. In addition, we show that at zero magnetic field, exotic spin liquid states with ring-like degeneracy emerge at intermediate temperatures, which are broken by thermal fluctuations selecting different multiple-q states. These findings greatly enrich the research on antiferromagnetic skyrmions in centrosymmetric materials or lattices including relatively weak Dzyaloshinskii-Moriya interaction.
