论文标题
二维超电压气体的集体模式和超流量
Collective modes and superfluidity of a two-dimensional ultracold Bose gas
论文作者
论文摘要
量子液体形状的集体模式并深刻影响其特性，包括其新兴现象，例如超流体。在这里，我们介绍了二维Bose气体如何响应移动的晶格潜力。特别是我们讨论诱导的加热速率如何取决于相互作用强度和温度。这项研究是由Sobirey {\ it等人} Arxiv的最新测量结果激励的：2005.07607（2020），我们为此提供了定量的理解。超越了现有的测量值，我们证明了这种探测方法允许识别量子液体中的第一和第二声音。我们表明，这两种声音模式随着相互作用强度的函数而经历杂交，我们建议通过实验检测。这使人们对通过声音模式的层次结构定义了bose气体的两个机制有一个新的见解。
The collective modes of a quantum liquid shape and impact its properties profoundly, including its emergent phenomena such as superfluidity. Here we present how a two-dimensional Bose gas responds to a moving lattice potential. In particular we discuss how the induced heating rate depends on the interaction strength and the temperature. This study is motivated by the recent measurements of Sobirey {\it et al.} arXiv:2005.07607 (2020), for which we provide a quantitative understanding. Going beyond the existing measurements, we demonstrate that this probing method allows to identify first and second sound in quantum liquids. We show that the two sound modes undergo hybridization as a function of interaction strength, which we propose to detect experimentally. This gives a novel insight into the two regimes of Bose gases, defined via the hierarchy of sounds modes.
