论文标题
活性诱导的量子多体系统中的相变
Activity-induced phase transition in a quantum many-body system
论文作者
论文摘要
一群非平衡实体可以显示传统平衡设置中禁止的相变行为。一个有趣的问题是，在纯量子系统中是否也发生了类似的活动驱动相变。在这里，我们引入了一个最小的简单量子多体模型，该模型经历了非热性引起的量子相变。该模型基于经典的各向异性晶格气体模型，该模型经历了运动性诱导的相分离（MIP），量子相图包括其他活性相，例如羊群。原则上可以在超低原子实验中测试的量子相跃迁也被鉴定为在应用偏置场时经典动力学中动力学路径的跃迁。这种方法阐明了经典的非平衡动力学与非铁量子量子物理学之间的有用联系。
A crowd of nonequilibrium entities can show phase transition behaviors that are prohibited in conventional equilibrium setups. An interesting question is whether similar activity-driven phase transitions also occur in pure quantum systems. Here we introduce a minimally simple quantum many-body model that undergoes quantum phase transitions induced by non-Hermiticity. The model is based on a classical anisotropic lattice gas model that undergoes motility-induced phase separation (MIPS), and the quantum phase diagram includes other active phases such as the flocking phase. The quantum phase transitions, which in principle can be tested in ultracold atom experiments, is also identified as the transitions of dynamical paths in the classical kinetics upon the application of biasing fields. This approach sheds light on the useful connection between classical nonequilibrium kinetics and non-Hermitian quantum physics.
