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首页> 外文期刊>Bulletin of the American Physical Society >APS -APS March Meeting 2017 - Event - Multimagnon bound states in a 2D system of coupled frustrated ferromagnetic chains
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APS -APS March Meeting 2017 - Event - Multimagnon bound states in a 2D system of coupled frustrated ferromagnetic chains

机译：APS -APS 2017年3月会议-事件-耦合受挫铁磁链的2D系统中的多磁子束缚态

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摘要

In strong applied fields, ferromagnetic spin chains with a frustrating antiferromagnetic next-nearest-neighbor interaction are known to have exotic ``spin-nematic'' ground states described by a Luttinger liquid of Bose-condensed {it bound states} of two or more magnons. These ground states have nontrivial composite order parameters, reflecting the fact that the $U(1)$ spin symmetry about the applied field is not broken all the way down to the identity. We numerically study the stability of these magnon bound states when these chains are coupled into a two-dimensional kagom'{e} lattice (resulting in a spatially anisotropic Hamiltonian that may describe the material $ext{Cu}_3ext{V}_2ext{O}_7(OH)_2 cdot 2ext{H}_2ext{O}$ (volborthite)). We find that even very weak (although nonzero) couplings cause the magnon pairs to unbind, suggesting that this exotic magnon pair-condensation may be difficult to realize in higher than one dimension.
机译：在强大的应用领域中，具有令人沮丧的反铁磁下一近邻相互作用的铁磁自旋链已知具有奇异的``自旋向列相''基态，该基态由玻色缩合的（两束缚态）的Luttinger液体描述。马农。这些基态具有非平凡的复合阶数参数，反映出以下事实：关于外加磁场的$ U（1）$自旋对称性并未一直分解到恒等式。当这些链耦合成二维kagom'{e}晶格（导致空间各向异性哈密顿量，可以描述材料$ ext {Cu} _3ext {V} _2ext {O } _7（OH）_2 cdot 2ext {H} _2ext {O} $（Volborthite））。我们发现，即使非常弱的耦合（尽管非零）也会导致磁振子对解除结合，这表明这种奇异的磁振子对的凝聚可能难以在一个以上的维度上实现。

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