论文标题
通过连贯的二维光谱法直接和超快探测量子多体相互作用和Mott-runsulator转变
Direct and ultrafast probing of quantum many-body interaction and Mott-insulator transition through coherent two-dimensional spectroscopy
论文作者
论文摘要
量子多体系统中粒子之间的相互作用在确定系统的电，磁，光学和热特性方面起着至关重要的作用。激光 - 脉冲技术的最新进展使超快时间标准上物理特性的操纵和测量。在这里，我们提出了一种通过连贯的二维（2D）光谱法直接和超快探测量子多体相互作用的方法。最多达到中等相互作用的强度，颗粒间相互作用在2D频谱中的异构峰的出现中表现出来，随着系统接近强烈相互作用的策略，所有峰会融合到单个对角线峰。第二频谱的演变是第二激光脉冲之间的时间延迟的函数，可以提供有关相互作用超快时间变化的重要信息。
Interactions between particles in quantum many-body systems play a crucial role in determining the electric, magnetic, optical, and thermal properties of the system. The recent progress in the laser-pulse technique has enabled the manipulations and measurements of physical properties on ultrafast timescales. Here, we propose a method for the direct and ultrafast probing of quantum many-body interaction through coherent two-dimensional (2D) spectroscopy. Up to a moderate interaction strength, the inter-particle interaction manifests itself in the emergence of off-diagonal peaks in the 2D spectrum before all the peaks coalesce into a single diagonal peak as the system approaches the Mott-insulating phase in the strongly interacting regime. The evolution of the 2D spectrum as a function of the time delay between the second and third laser pulses can provide important information on the ultrafast time variation of the interaction.
