双色高次谐波光谱揭示一维Mott绝缘体中的亚周期双占据-空穴动力学
Sub-cycle doublon-holon dynamics in one-dimensional Mott insulators revealed by two-color high-harmonic spectroscopy
- Purdue University（普渡大学）
- Los Alamos National Laboratory（洛斯阿拉莫斯国家实验室）
- Colorado State University（科罗拉多州立大学）
- Brookhaven National Laboratory（布鲁克海文国家实验室）
- Joint Attosecond Science Laboratory (JASLab), National Research Council of Canada and University of Ottawa（联合阿秒科学实验室（JASLab），加拿大国家研究委员会和渥太华大学）
机构由 AI 辅助整理，请以论文原文为准。
中文总结 AI 辅助
通过测量一维Mott绝缘体的高次谐波发射啁啾，揭示了亚周期双占据-空穴复合动力学及其阶数依赖的退相干，为强驱动相关材料非平衡研究提供新视角。
中文摘要 AI 辅助
固态高次谐波光谱正成为探测非平衡多体动力学的新兴工具。然而，在强驱动相关材料的高次谐波发射过程中，对亚光学周期动力学的直接测量仍 largely 未被探索。在此，我们测量了典型一维Mott绝缘体中的高次谐波发射啁啾，该啁啾编码了亚光学周期时间尺度上强驱动的双占据-空穴动力学。我们观察到带隙以上谐波的正啁啾，表明高次谐波主要由双占据-空穴复合主导。我们进一步展示了依赖于谐波阶数的退相干，这可通过与每个谐波相关的不同双占据-空穴 excursion 距离来理解。这些结果揭示了Mott绝缘体中相干的双占据-空穴动力学及其超快退相干，这与 Floquet 工程等其他非平衡光致现象相关。
英文摘要
Solid-state high-harmonic spectroscopy is becoming an emerging tool for probing nonequilibrium many-body dynamics. Yet, direct measurements of strongly driven, sub-optical-cycle dynamics in correlated materials during high-harmonic emission remain largely unexplored. Here, we measure high-harmonic emission chirp in a prototypical one-dimensional Mott insulator, which encodes strongly driven doublon-holon dynamics at sub-optical-cycle timescales. We observe a positive chirp for above band gap harmonics, indicating that high harmonics are dominated by doublon-holon recombinations. We further show a harmonic order-dependent dephasing, which can be understood through different doublon-holon excursion distances associated with each harmonic. These results reveal coherent doublon-holon dynamics and their ultrafast dephasing in Mott insulators, which is relevant to other nonequilibrium light-induced phenomena, such as Floquet engineering.
