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arXiv 1706.01899cond-mat.str-el
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U(1)分形子的变温筛选

Finite-Temperature Screening of U(1) Fractons

Michael Pretko

摘要:

研究了分形子激发下三维U(1)自旋液相的有限温度屏蔽行为。与常规U(1)自旋液体共有几个特征。该系统可以在低温下在宏观长度尺度上表现出自旋液体物理,但屏蔽效应最终导致在足够大的距离上平滑的有限温度过渡到平凡相。然而,与更传统的U(1)自旋液体不同,我们发现完全低温筛选分形子不仅需要非常大的距离,而且需要非常长的时间尺度。在最长的时间尺度上,带电扰动(fracton)将获得其他fracton的筛选云,导致系统中只有短程相关。另一方面,在中间的时间尺度上,一个分形子只能被移动激发云部分屏蔽,在系统中留下弱的幂律相关性。这种剩余的幂律相关性可能是一个有用的诊断在实验中寻找U(1)分形相。

英文摘要:

We investigate the finite-temperature screening behavior of three-dimensional U(1) spin liquid phases with fracton excitations. Several features are shared with the conventional U(1) spin liquid. The system can exhibit spin liquid physics over macroscopic length scales at low temperatures, but screening effects eventually lead to a smooth finite-temperature crossover to a trivial phase at sufficiently large distances. However, unlike more conventional U(1) spin liquids, we find that complete low-temperature screening of fractons requires not only very large distances, but also very long timescales. At the longest timescales, a charged disturbance (fracton) will acquire a screening cloud of other fractons, resulting in only short-range correlations in the system. At intermediate timescales, on the other hand, a fracton can only be partially screened by a cloud of mobile excitations, leaving weak power-law correlations in the system. Such residual power-law correlations may be a useful diagnostic in an experimental search for U(1) fracton phases.

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