论文标题
能量带回声：光学驱动的准粒子波袋的时间倒转光发射
Energy-band echoes: Time-reversed light emission from optically driven quasiparticle wavepackets
论文作者
论文摘要
量子状态的意愿控制是量子科学技术的主要目标。著名的Hahn Echo基于几个级别系统中的时间反转过程来体现这种量子状态控制。在这里，我们提出了与量子多体系统中能量波段结构相关的不同回声现象。我们表明，驱动的电场脉冲可以逆转准粒子波袋的动力学，当准颗粒重新组合时，光激发脉冲的时光波形产生回声。目前的回声不仅在带绝缘子中，而且在相关的绝缘子中观察到，包括莫特绝缘子和自发破碎的对称性电荷有序的绝缘子，在单维系统中，无论模型的集成性如何。分析表达式揭示了回声出现的条件，它们还表明回声脉冲的频率反映了准粒子的分散关系，例如电子孔对，doublon-holon对和扭结 - 坦基克克对。这些发现为量子多体系统中准颗粒的全光动量分辨光谱法提供了一个框架。
The at-will control of quantum states is a primary goal of quantum science and technology. The celebrated Hahn echo exemplifies such quantum-state control based on a time-reversal process in a few-level system. Here, we propose a different echo phenomenon associated with the energy-band structure in quantum many-body systems. We show that the dynamics of quasiparticle wavepackets can be reversed by a driving electric-field pulse, yielding echoes with the time-reversed waveform of the optical excitation pulse when the quasiparticles recombine. The present echoes are observed not only in band insulators but also in correlated insulators, including a Mott insulator and a spontaneously-broken-symmetry charge-ordered insulator, in one- and higher-dimensional systems, irrespective of the integrability of the models. Analytical expressions reveal the conditions under which the echoes appear, and they also indicate that the frequency of the echo pulses reflects the dispersion relation for quasiparticles such as electron-hole pairs, doublon-holon pairs, and kink-antikink pairs. These findings provide a framework for all-optical momentum-resolved spectroscopy of the quasiparticles in quantum many-body systems.
