发表机构
University of Luxembourg; University of Augsburg（卢森堡大学; 奥格斯堡大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究揭示活性量子群可自发打破U(1)对称性产生超流性，通过Lindblad动力学模型推导出群集相向非对角长程序的不稳定性，开辟了非平衡量子物质研究新方向。
AI 中文摘要
活性量子物质最近在生物物理学与量子多体物理学的交叉领域出现，将生命系统的自组织与量子世界的相干性相结合。活性量子系统已被证明表现出群集行为——这是一种在平衡量子物理学中无先例的集体现象。在这项工作中，我们揭示了活性量子群中一个意想不到的量子有序层次：它们可以变得超流。我们表明，除了与其定向运动相关的对称性破缺外，这些群还可以打破额外的U(1)对称性，从而产生非对角长程序。对于由Lindblad动力学控制的活性硬核玻色子微观模型，我们推导了单粒子密度矩阵的有效长波描述，并证明群集相会发展出向非对角长程序的不稳定性，这是超流行为的特征。我们的发现揭示了活性量子物质是发现量子物质奇异非平衡相的一个有前景的研究方向。
英文摘要
Active quantum matter has very recently emerged at the intersection between bio- and quantum many-body physics, combining the self-organization of living systems with the coherence of the quantum world. Active quantum systems have been shown to exhibit flocking - a collective phenomenon with no precedent in equilibrium quantum physics. In this work we uncover an unexpected layer of quantum order in active quantum flocks: they can become superfluid. We show that, in addition to the symmetry breaking associated with their directed motion, these flocks can also break an additional U(1) symmetry, giving rise to off-diagonal long-range order. For a microscopic model of active hard-core bosons governed by Lindblad dynamics, we derive an effective long-wavelength description of the single-particle density matrix and demonstrate that the flocking phase develops an instability toward off-diagonal long-range order characteristic of superfluid behavior. Our findings reveal active quantum matter as a promising research direction for discovering exotic nonequilibrium phases of quantum matter.
CommentsCombined main manuscript and supplementary material
