arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2109.01495cond-mat.quant-gasquant-ph
收藏

自旋-轨道耦合玻色气体的激发态量子相变

Excited-state quantum phase transitions in spin-orbit coupled Bose gases

Josep Cabedo, Alessio Celi

备注：
10 pages, 8 figures
发表信息：
Phys. Rev. Research 3, 043215 (2021)
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

激发态量子相变依赖于并揭示了多体系统的整个光谱结构。虽然它们在理论上很好理解，但在实际实验中找到合适的签名并检测它们仍然具有挑战性。例如，在旋量气体中，激发态相已经通过拓扑序参量被识别和表征，这在实验中是具有挑战性的测量。在这里，我们提出拉曼修饰的自旋轨道耦合气体作为一个新的平台，探索激发态量子相变。在弱耦合状态下，缀饰系统等价于自旋-自旋相互作用可调的旋量气体。通过这种等价性，我们能够定义一个新的激发态相位的修饰气体。相位的特征在于由自旋轨道耦合引起的空间密度调制或条纹的行为，并且原则上可以在当前最先进的超冷原子实验中测量。相反，我们表明，激发相的属性可以利用，以准备大而稳定的密度调制条纹状态。

英文摘要：

Excited-state quantum phase transitions depend on and reveal the structure of the whole spectrum of many-body systems. While they are theoretically well understood, finding suitable signatures and detect them in actual experiments remains challenging. For instance, in spinor gases, excited-state phases have been identified and characterized through a topological order parameter that is challenging to measure in experiments. Here, we propose the Raman-dressed spin-orbit coupled gas as a novel platform to explore excited-state quantum phase transitions. In a weakly-coupled regime, the dressed system is equivalent to a spinor gas with tunable spin-spin interactions. Through this equivalence we are able to define a new excited-state phase of the dressed gas. The phase is characterize by the the behavior of the spatial density modulations, or stripes, induced by spin-orbit coupling, and can in principle be measured in current state-of-the-art experiments with ultracold atoms. Conversely, we show that the properties of the excited phase can be exploited to prepare stripe states with large and stable density modulations.

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。

↑