论文标题
表征Lipkin-Meshkov-Glick激发光谱通过量子相干谱
Characterizing the Lipkin-Meshkov-Glick excited spectrum through the quantum coherence spectrum
论文作者
论文摘要
激发态量子相变的量将量子相变概念扩展到基态之外，并提供对量子系统复杂行为的见解。在目前的工作中，我们评估了在Lipkin-Meshkov-Glick模型框架内探测激发态量子相变的有效工具的使用。多量子相干频谱的时间依赖性和长期平均值揭示了复杂的动态，这源于量子多体系统激发频谱中奇异性的存在。
Excited-state quantum phase transitions extend the quantum phase transition concept beyond the ground state and offer insights into the complex behavior of quantum systems. In the present work, we assess the use of the multiple quantum coherence spectrum as a valid tool to probe excited state quantum phase transitions within the framework of the Lipkin-Meshkov-Glick model. The time dependence and the long-time average of the multiple quantum coherence spectrum reveal the intricate dynamics that stems from the existence of singularities in the excited spectrum of a quantum many-body system.
