高自旋Kitaev磁体中的三半子晶体
Triple-meron crystal in high-spin Kitaev magnets
AI总结：
针对高自旋Kitaev磁体，数值研究含单离子各向异性的经典Kitaev-$Γ$模型，发现含三个半子的奇异自旋织构（单磁胞中奇数个半子），揭示其拓扑霍尔效应，为自旋电子学及退禁闭机制研究提供平台。
摘要：
具有非平庸拓扑的自旋织构因其对局部形变的鲁棒性，在未来自旋电子学应用中极具前景。作为这类自旋织构之一的半子（meron），因其拓扑等价于半个斯格明子，被广泛认为以成对形式出现。受高自旋Kitaev磁体近期进展的启发，我们在此数值研究了具有单离子各向异性的经典Kitaev-$Γ$模型。发现了一种包含三个半子的奇异自旋织构。这种状态的特点是一个磁单胞中存在奇数个半子，且能诱导拓扑霍尔效应。因此，这些半子无法像文献报道的那样从斯格明子中解离，这种退禁闭现象的通用机制需要进一步研究。我们的工作表明，高自旋Kitaev磁体可承载鲁棒的非常规自旋织构，为探索自旋电子学中的奇异态以及理解凝聚态物理和场论中的退禁闭机制提供了多功能平台。
英文摘要：
Spin textures with nontrivial topology hold great promise in future spintronics applications since they are robust against local deformations. The meron, as one of such spin textures, is widely believed to appear in pairs due to its topological equivalence to a half skyrmion. Motivated by recent progresses in high-spin Kitaev magnets, here we investigate numerically a classical Kitaev-$Γ$ model with a single-ion anisotropy. An exotic spin texture including three merons is discovered. Such a state features a peculiar property with an odd number of merons in one magnetic unit cell and it can induce the topological Hall effect.Therefore, these merons cannot be dissociated from skyrmions as reported in the literature and a general mechanism for such a deconfinement phenomenon calls for further studies. Our work demonstrates that high-spin Kitaev magnets can host robust unconventional spin textures and thus they offer a versatile platform not only for exploring exotic states in spintronics but also for understanding the deconfinement mechanism in the condensed-matter physics and the field theory.
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