论文标题
光谱阻尼没有准粒子衰减：二维量子Heisenberg抗fiferromagnets的动态结构因子
Spectral damping without quasiparticle decay: The dynamic structure factor of two-dimensional quantum Heisenberg antiferromagnets
论文作者
论文摘要
二维Heisenberg抗铁磁铁在量子磁性中起着核心作用，但是在有限温度下，这些系统中动态相关性的性质一直在几十年来一直尚不清楚。我们通过使用新型的量子古典二元性来分析动态结构因子来解决这个长期存在的问题，并且在矛盾的是，尽管很长的准二粒寿命，但仍会找到较大的频率频谱。该解决方案揭示了新的多尺度物理，外部探针创建了一个包含无限量化的经典辐射场。至关重要的是，这种现象的多尺度性质阻止了常规的重生群体方法。我们还在静态相关性上挑战了共同的智慧，并执行蒙特卡洛模拟，这表明了与我们的理论非常同意。
Two-dimensional Heisenberg antiferromagnets play a central role in quantum magnetism, yet the nature of dynamic correlations in these systems at finite temperature has remained poorly understood for decades. We solve this long-standing problem by using a novel quantum-classical duality to calculate the dynamic structure factor analytically and, paradoxically, find a broad frequency spectrum despite the very long quasiparticle lifetime. The solution reveals new multi-scale physics whereby an external probe creates a classical radiation field containing infinitely-many quanta. Crucially, it is the multi-scale nature of this phenomenon which prevents a conventional renormalization group approach. We also challenge the common wisdom on static correlations and perform Monte Carlo simulations which demonstrate excellent agreement with our theory.
