Seminar: Toward high-harmonic spectroscopy of strongly correlated electron systems, by Yuta Murakami

TITLE: Toward high-harmonic spectroscopy of strongly correlated electron systems

AUTHOR: Yuta Murakami

WHEN: May, 19 - 3PM

WHERE: Salón de Actos, ICMM

INVITED BY: Rui Emanuel Ferreira da Silva

ABSTRACT: High-harmonic generation (HHG) is a fundamental nonlinear optical phenomenon arising from strong light–matter interactions. Initially discovered in gases, HHG has since been extended to condensed matter systems. Extensive efforts have been made to understand and exploit HHG in semiconductors and semimetals. However, the effects of many-body correlations, which often play pivotal roles in condensed matter, remain largely unexplored. In particular, strongly correlated electron systems (SCESs) provide a new frontier for HHG research because of their nontrivial excitation structures, rich phases, and dynamical tunability [1].<br />\r\nIn this seminar, we would like to share our view of HHG in SECSs obtained by a series of theoretical studies [2-4]. We show that HHG in SCESs is directly related to the dynamics of elementary excitations emerging out of strong correlations and reveal the importance of dephasing mechanisms, which lead to the unique behavior of HHG. Furthermore, we discuss the relation between HHG spectral features and photoinduced phase transitions through a collaboration with experiments on the prototypical Mott insulator Sr2CuO3 [5].

[1] Y. Murakami*, D. Golež*, M. Eckstein* and P. Werner*, RMP 97, 035001 (2025).

[2] Y. Murakami, M. Eckstein and P. Werner, PRL 121, 057405 (2018).

[3] Y. Murakami, K. Uchida, A. Koga, K. Tanaka and P. Werner, PRL 129, 157401 (2022).

[4] Y. Murakami, T. Hansen, S. Takayoshi, L. Madsen and P. Werner, PRL 134, 096504 (2025).

[5] R. Ikeda, Y. Murakami, D. Sakai, T. Miyamoto, T. Ito, H. Okamoto, arXiv:2508.00296.