论文标题
在强驱动的Mott绝缘子中，Keldysh电荷动力学的空间控制
Keldysh space control of charge dynamics in a strongly driven Mott insulator
论文作者
论文摘要
在强低频光学驱动条件下，莫特绝缘子的命运是量子多体动力学的基本问题。使用Ultrafast宽带光谱，我们测量了瞬时电子结构和电荷动力学的动力学，该动力学的泵发莫特绝缘子CA $ _2 $ ruo $ _4 $。我们观察到连贯的带宽重归其化和非线性双龙 - 霍隆对产生，并在100秒左右的泵脉冲持续时间内快速连续。通过扫描电场振幅，我们展示了连续的带宽调整和从多光子吸收到量子隧道统治的生产状态的Keldysh交叉。我们的结果提供了一个程序，可以控制Mott绝缘子中的相干和非线性加热过程，从而促进了在密切相关的系统中发现新颖平衡现象的新型现象。
The fate of a Mott insulator under strong low frequency optical driving conditions is a fundamental problem in quantum many-body dynamics. Using ultrafast broadband optical spectroscopy, we measured the transient electronic structure and charge dynamics of an off-resonantly pumped Mott insulator Ca$_2$RuO$_4$. We observe coherent bandwidth renormalization and nonlinear doublon-holon pair production occurring in rapid succession within a sub-100 femtosecond pump pulse duration. By sweeping the electric field amplitude, we demonstrate continuous bandwidth tuning and a Keldysh cross-over from a multi-photon absorption to quantum tunneling dominated pair production regime. Our results provide a procedure to control coherent and nonlinear heating processes in Mott insulators, facilitating the discovery of novel out-of-equilibrium phenomena in strongly correlated systems.
