论文标题
抗铁磁性巡回三角形磁铁中的Skyrmion晶体相
Skyrmion crystal phases in antiferromagnetic itinerant triangular magnets
论文作者
论文摘要
通常，天空在手性磁铁中形成三角形晶体。在这里，我们研究了巡回电子对使用巨大耦合极限的昆多晶格模型的Skyrmion晶体（SKX）对三角晶格结构的影响，并将局部旋转作为经典载体。为了模拟系统，我们采用了混合马尔可夫链蒙特卡洛法（HMCMC），其中包括每个MCMC更新的经典旋转中的电子对角线化。我们在电子密度$ n = 1/3 $下以$ 12 $ 12 $系统的价格呈现低温结果，当我们提高流动电子的跳跃强度时，Skyrmion的数量突然增加。我们发现，这种高的Skyrmion数量SKX相通过组合效应稳定：降低电子状态的密度，填充$ n = 1/3 $，并且还将底部能量状态进一步向下推动。我们表明，使用HMCMC的旅行群集变化，这些结果适用于较大的系统。我们预计巡游三角磁铁可能会通过施加外部压力表现出低密度向高密度SKX相之间的过渡。
Very often the skyrmions form a triangular crystal in chiral magnets. Here we study the effect of itinerant electrons on the structure of skyrmion crystal (SkX) on triangular lattice using Kondo lattice model in the large coupling limit and treating the localized spins as classical vectors. To simulate the system, we employ hybrid Markov Chain Monte Carlo method (hMCMC) which includes electron diagonalization in each MCMC update for classical spins. We present the low temperature results for $12\times 12$ system at electron density $n=1/3$ which show a sudden jump in skyrmion number when we increase the hopping strength of the itinerant electrons. We find that this high skyrmion number SkX phase is stabilized by combined effects: lowering of density of states at electron filling $n=1/3$ and also pushing the bottom energy states further down. We show that these results hold for larger system using travelling cluster variation of hMCMC. We expect that itinerant triangular magnets might exhibit the possible transition between low density to high density SkX phases by applying external pressure.
