标题： 反铁磁Kitaev模型在强磁场下的动态结构因子 显示英文标题

标题： Dynamic structure factor of the antiferromagnetic Kitaev model in large magnetic fields

摘要： 我们通过在高磁场极限下应用微扰连续单元变换，研究了反铁磁Kitaev蜂窝模型在磁场中的动态结构因子。 计算了高磁场极化相中裸露基本自旋翻转激发的一和两准粒子特性，这些特性解释了动态结构因子中的大部分光谱权重。 我们讨论了这些准粒子区域中光谱特性的演变，包括单准粒子色散、双准粒子连续谱、束缚态的形成以及准粒子衰变。 特别是，在最上层双准粒子连续谱的上方存在一个比较强的光谱特征，代表了由于最近邻密度-密度相互作用形成的三个反束缚态。 显示英文摘要

摘要： We investigate the dynamic structure factor of the antiferromagnetic Kitaev honeycomb model in a magnetic field by applying perturbative continuous unitary transformations about the high-field limit. One- and two-quasiparticle properties of the dressed elementary spin-flip excitations of the high-field polarized phase are calculated which account for most of the spectral weight in the dynamic structure factor. We discuss the evolution of spectral features in these quasiparticle sectors in terms of one-quasiparticle dispersions, two-quasiparticle continua, the formation of antibound states, and quasiparticle decay. In particular, a comparably strong spectral feature above the upper edge of the upmost two-quasiparticle continuum represents three antibound states which form due to nearest-neighbor density-density interactions.