论文标题
激发态量子相变于纺纱子晶体中
Excited-state quantum phase transitions in spinor Bose-Einstein condensates
论文作者
论文摘要
激发态量子相变（ESQPTS）将量子相变的概念扩展到基态之外。它们的特征是在频谱中缩小能量差距。识别ESQPTS的订单参数构成了一个重大挑战。我们介绍了纺纱子玻璃体凝结物，作为用于研究ESQPTS的多功能平台。基于平均场动力学，我们定义了一个拓扑顺序参数，该参数区分激发态阶段，并讨论如何在当前实验中干预访问顺序参数。我们的工作为原子多体系统中激发态量子相的实验表征开辟了道路。
Excited-state quantum phase transitions (ESQPTs) extend the notion of quantum phase transitions beyond the ground state. They are characterized by closing energy gaps amid the spectrum. Identifying order parameters for ESQPTs poses however a major challenge. We introduce spinor Bose-Einstein condensates as a versatile platform for studies of ESQPTs. Based on the mean-field dynamics, we define a topological order parameter that distinguishes between excited-state phases, and discuss how to interferometrically access the order parameter in current experiments. Our work opens the way for the experimental characterization of excited-state quantum phases in atomic many-body systems.
