Speaker
Description
The interaction of intense, short, and (near)resonant laser pulses with a two-level quantum system induces intricate dynamics, characterized by Rabi oscillations (ROs) [1] and dynamic interference (DI) [2], both of which manifest as multi-peak patterns in the photo-electron spectrum. These phenomena, central to strong-field light-matter interactions, often coexist in the Autler-Townes (AT) doublet, making their individual contributions challenging to disentangle. In this study, we investigate the multi-peak structure of the AT doublet through two-photon ionization of hydrogen, employing a combined analytical and numerical framework to uncover its physical origins [3].
Our results reveal that the selective population of dynamically dressed states critically determines the interplay between ROs and DI. Under resonant conditions, ROs dominate, producing quasi-symmetric multi-peak patterns directly correlated with the number of Rabi cycles completed. Conversely, detuned laser pulses suppress ROs, enabling DI to govern the spectrum, resulting in asymmetric, interference-driven modulations. By analyzing the photoelectron spectra and the dynamics of dressed states, we identify distinct spectral signatures marking the transition from RO- to DI-dominated regimes, building on and refining prior insights [2]. These findings deepen our understanding of ultrafast quantum dynamics and pave the way for precise control of light-induced processes in the XUV regime, with potential applications in quantum optics and attosecond science.
[1] S. Nandi et al., Nature 608, 488 (2022).
[2] A. Tóth, S. Borbély, and A. Csehi, Phys. Rev. A 108, L061101 (2023).
[3] A. Ait Elarabi and A. Csehi, Phys. Rev. A 111, 033107 (2025).
