联系人：万源（9403）

报告信息：
Out-of-Equilibrium Dynamics of Correlated Quantum Matter Beyond the Pump-Probe

With the recent advances in ultrafast laser technology, the generation, control, and understanding of nonequilibrium dynamics in correlated quantum materials have emerged as central themes in modern condensed matter physics. Such intricate dynamical couplings often give rise to emergent phenomena without equilibrium analogs.[1]

While conventional pump-probe experiments have provided valuable insights into these processes, they face inherent limitations in capturing the full complexity of ultrafast evolution. In particular, the trade-off between energy resolution and pulse duration constrains their ability to resolve excitation and relaxation pathways, as well as the coherent dynamics of short-lived transient states in strongly correlated systems. To overcome these challenges, multidimensional coherent spectroscopy (MDCS) has emerged as a powerful alternative. This advanced technique employs a sequence of laser pulses with precisely controlled relative delays, systematically scanning an array of temporal configurations to map out nonlinear responses with high temporal and spectral resolution.

In this talk, I will first give present the practical workflow of simulating out-of-equilibrium dynamics in correlated materials with the ab initio nonequilibrium dynamical mean-field theory implemented within the Keldysh formalism. [2-4] Then, I will introduce the concepts and principles of the MDCS, illustrating its application to the study of nonlinear charge dynamics, as well as the collective modes in correlated electron systems. [5-7]

[1] RMP 97 (3), 035001 (2025)
[2] RMP 86 (2), 779 (2014)
[3] PRB 107 (16), 165102 (2023)
[4] PRB 109 (20), L201101 (2024)
[5] npj Comput. Mater. 11, 127 (2025)
[6] arXiv:2504.21351 (2025)
[7] arXiv:2512.19689 (2025)

报告人简介：
Jiyu Chen has recently joined the attoscience center of SLAB as an assistant researcher, after obtaining his PhD from University of Fribourg in Switzerland, advised by Prof. Philipp Werner. Before, he studied in University of Chinese Academy of Sciences (UCAS) in Beijing and Swiss Federal Technology Institute of Lausanne (EPFL) in Switzerland.