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arXiv 2303.09573cond-mat.stat-mechcond-mat.quant-gascond-mat.str-elhep-thquant-ph
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Fracton超流体流体力学

Fracton superfluid hydrodynamics

Charles Stahl, Marvin Qi, Paolo Glorioso, Andrew Lucas, Rahul Nandkishore

AI总结:

本文用有效场论分析电荷与偶极子对称性自发破缺的fracton流体力学,给出多种传播与弛豫模式的色散预测。

摘要:

我们利用系统的有效场论研究了具有自发破缺多极对称性的系统的流体力学。我们聚焦于最简单的非平凡情形:一个具有电荷和偶极子对称性、但不具有动量守恒的系统。当没有对称性破缺时,我们的形式体系重现了具有守恒偶极矩的“fracton流体力学”所特有的四次方次扩散(ω∼-i k^4)。我们的形式体系还刻画了电荷和/或偶极子对称性的自发破缺。当电荷对称性自发破缺时,流体力学模式以二次方传播并以四次方弛豫(ω∼±k^2-ik^4)。当偶极子对称性自发破缺但电荷对称性保持时,我们发现二次方弛豫(扩散)的横向模式,以及另一个模式;后者依参数不同可能是纯扩散的(ω∼-i k^2),也可能是二次方传播且二次方弛豫的(ω∼±k^2-i k^2)。我们的工作给出了可在近期冷原子实验中检验的具体预测,并构建了可用于研究具有自发破缺多极对称性系统的通用框架。

英文摘要:

We examine the hydrodynamics of systems with spontaneously broken multipolar symmetries using a systematic effective field theory. We focus on the simplest non-trivial setting: a system with charge and dipole symmetry, but without momentum conservation. When no symmetries are broken, our formalism reproduces the quartic subdiffusion ($ω\sim -i k^4$) characteristic of `fracton hydrodynamics' with conserved dipole moment. Our formalism also captures spontaneous breaking of charge and/or dipole symmetry. When charge symmetry is spontaneously broken, the hydrodynamic modes are quadratically propagating and quartically relaxing ($ω\sim \pm k^2 - ik^4$). When the dipole symmetry is spontaneously broken but the charge symmetry is preserved, then we find quadratically relaxing (diffusive) transverse modes, plus another mode which depending on parameters may be either purely diffusive ($ω\sim -i k^2$) or quadratically propagating and quadratically relaxing ($ω\sim \pm k^2 -i k^2$). Our work provides concrete predictions that may be tested in near-term cold atom experiments, and also lays out a general framework that may be applied to study systems with spontaneously broken multipolar symmetries.

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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