Excitation and transport of bound magnon clusters in frustrated ferromagnetic chain
Excitation and transport of bound magnon clusters in frustrated ferromagnetic chain
复制标题
受挫铁磁链中束缚磁振子簇的激发和传输
DOI：
10.1088/1742-6596/2207/1/012045
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
H. Onishi
中科院分区：
文献类型：
--
作者：
Tokimoto Jun;Tsuchiya Shunji;Nikuni Tetsuro;大橋洋士;H. Onishi
利用密度矩阵重整化群方法研究了磁场中具有铁磁最近邻和反铁磁次近邻交换耦合的阻挫自旋链的磁激发和自旋输运性质.在场诱导四极和八极区，低能激发分别由两个和三个磁振子束缚态控制，因此束缚磁振子团簇将有助于自旋输运。我们发现，当系统从四极区进入八极区时，自旋电流相关性降低。这表明自旋输运在八极区被抑制，尽管束缚三磁振子团簇比束缚两磁振子团簇携带更大量的角动量。
We investigate magnetic excitations and spin transport properties of a frustrated spin chain with ferromagnetic nearest-neighbor and antiferromagnetic next-nearest-neighbor exchange couplings in a magnetic field by density-matrix renormalization group methods. In the field-induced quadrupole and octupole regimes, the low-energy excitation is governed by two-and three-magnon bound states, respectively, so that bound magnon clusters would contribute to the spin transport. We show that spin current correlations decrease when the system goes from the quadrupole regime into the octupole regime. This indicates that the spin transport is suppressed in the octupole regime, although bound three-magnon clusters carry a larger amount of angular momentum than bound two-magnon clusters.