Vortices, skyrmions, and chirality waves in frustrated Mott insulators with a quenched periodic array of impurities
Vortices, skyrmions, and chirality waves in frustrated Mott insulators with a quenched periodic array of impurities
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DOI：
10.1103/physrevb.94.174420
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发表时间：
2016-11-10
影响因子：
3.7
通讯作者：
Batista, Cristian D.
中科院分区：
文献类型：
--
作者：
Hayami, Satoru;Lin, Shi-Zeng;Batista, Cristian D.
在阻挫磁体中，磁Q不稳定性是相当常见的。当磁化率在通过晶格对称操作相关的多Q矢量处最大化时，可以遵循诸如涡旋和skyrmion晶体的奇异磁有序。在这里，我们表明，一个周期性的阵列，可以实现通过电荷密度波排序，导致丰富的相图具有过多的手性磁相，特别是当有一个简单的关系之间的倒易矢量的杂质超晶格和磁Q矢量。我们还研究了改变杂质浓度或干扰具有小猝灭随机性的杂质阵列的效果。简要讨论了杂质超晶格的其他实现方法。
Finite-Q magnetic instabilities are rather common in frustrated magnets. When the magnetic susceptibility is maximized at multiple-Q vectors related through lattice symmetry operations, exotic magnetic orderings such as vortex and skyrmion crystals may follow. Here, we show that a periodic array of nonmagnetic impurities, which can be realized through charge density wave ordering, leads to a rich phase diagram featuring a plethora of chiral magnetic phases, especially when there is a simple relation between the reciprocal vectors of the impurity superlattice and the magnetic Q vectors. We also investigate the effect of changing the impurity concentration or disturbing the impurity array with small quenched randomness. Alternative realizations of impurity superlattices are briefly discussed.