Multimagnon bound states in the frustrated ferromagnetic one-dimensional chain
Multimagnon bound states in the frustrated ferromagnetic one-dimensional chain
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DOI：
10.1103/physrevb.76.060407
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发表时间：
2007-08-01
影响因子：
3.7
通讯作者：
Furusaki, Akira
中科院分区：
文献类型：
--
作者：
Kecke, Lars;Momoi, Tsutomu;Furusaki, Akira
我们研究了磁场中具有竞争性铁磁最近邻和反铁磁次最近邻相互作用的一维海森堡链。从完全极化的高场态开始，我们计算最低 n 磁振子激励和饱和场的色散 (n=2,3,4)。我们表明，除了较小的参数范围外，最低激发态始终是总动量为 pi 的束缚多磁振子态。我们认为，束缚 n 个磁振子的玻色凝聚导致了具有多极相关性的新型 Tomonaga-Luttinger 液体；向列和三列有序液体对应于n=2和n=3。
We study a one-dimensional Heisenberg chain with competing ferromagnetic nearest-neighbor and antiferromagnetic next-nearest-neighbor interactions in a magnetic field. Starting from the fully polarized high-field state, we calculate the dispersions of the lowest-lying n-magnon excitations and the saturation field (n=2,3,4). We show that the lowest-lying excitations are always bound multimagnon states with a total momentum of pi except for a small parameter range. We argue that Bose condensation of the bound n magnons leads to novel Tomonaga-Luttinger liquids with multipolar correlations; nematic- and triatic-ordered liquids correspond to n=2 and n=3.