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arXiv 2007.11827cond-mat.str-el
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无准粒子衰减的谱阻尼:二维量子海森堡反铁磁体的动力学结构因子

Spectral damping without quasiparticle decay: The dynamic structure factor of two-dimensional quantum Heisenberg antiferromagnets

Matthew C. O'Brien, Oleg P. Sushkov

摘要:

二维海森堡反铁磁体在量子磁学中起着核心作用,但几十年来,这些系统在有限温度下的动力学关联的性质仍然知之甚少。我们解决了这个长期存在的问题,使用一种新的量子经典对偶计算的动态结构因子分析,矛盾的是,找到一个广泛的频谱,尽管很长的准粒子寿命。该解决方案揭示了新的多尺度物理学,即外部探针创建包含无限多量子的经典辐射场。至关重要的是,正是这种现象的多尺度性质阻止了传统的重整化群方法。我们还挑战的共同智慧的静态相关性和执行蒙特卡罗模拟,表现出良好的协议与我们的理论。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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