论文标题
从变形的蜘蛛网到具有远距离相互作用的抗铁磁性海森堡链中的连贯元音
From deconfined spinons to coherent magnons in an antiferromagnetic Heisenberg chain with long range interactions
论文作者
论文摘要
我们研究了具有交错的远距离相互作用的抗磁磁性（AFM）海森堡链的激发的频谱和性质，这两者都使用时间依赖性密度矩阵恢复归一化组（TDMRG）方法，并通过定性地解释其主要特征的多型Spinon近似方法。交换的未解决的远距离性质有效地增加了系统的维度，链条能够经历真正的对称性破坏并发展远距离顺序，从而从无间隙旋转液体过渡到无间隙的AFM相。我们计算了动量解决的旋转动力学结构因子，并发现对于弱腐烂的相互作用，néel秩序的出现可能与变成相干元音的纺纱子的结合状态的形成有关。准颗粒带从两翼连续体中泄漏出来，该连续体被推到更高的能量。我们的物理图片也得到了对激发的行为的分析。
We study the spectrum and the nature of the excitations of an antiferromagnetic (AFM) Heisenberg chain with staggered long range interactions, both numerically using the time-dependent density matrix renormalization group (tDMRG) method and by means of a multi-spinon approximation that qualitatively explains its main features. The unfrustrated long-range nature of the exchange effectively increases the dimensionality of the system and the chain is able to undergo true symmetry breaking and develop long range order, transitioning from a gapless spin liquid to a gapless ordered AFM phase. We calculated the momentum resolved spin dynamical structure factor and found that for weakly decaying interactions the emergence of Néel order can be associated to the formation of bound states of spinons that become coherent magnons. The quasiparticle band leaks out from the two-spinon continuum that is pushed up to higher energies. Our physical picture is also supported by an analysis of the behavior of the excitations in real-time.
