Abstract
Since 2011, S.Ghimire et al. first observe the high harmonic generation (HHG) from ZnO [1], HHG from solid become a rapidly growing field. It has been established as a promising source for Extreme Ultraviolet (EUV) radiation [1], moreover, it could be a powerful probe for various materials properties such as band structure [2], symmetry [3], and Berry phases [4]. In contrast, the study of phonon and lattice dynamics with HHG spectroscopy is rarely reported [5]. The most important reason is that the phonon effect in many lattice unit cells would counteract. However, the situation should be different in the pump-probe HHG experiments where the coherent phonon is excited. In our research, we aim to reveal the phonon dynamics in solids with pump-probe HHG experiments. Compared to the traditional ultrafast spectroscopy, the carrier-envelope-phase sensitivity of HHG could help to have time resolution well below the laser pulse duration [6]. In addition, to understand the phonon dynamics extracted from pump-probe HHG spectroscopy, theoretical simulation methods such as semiconductor Bloch equations are employed in our study.
Reference:
[1] Ghimire, S., DiChiara, A. D., Sistrunk, E., Agostini, P., DiMauro, L. F., & Reis, D. A. (2011). Observation of high-order harmonic generation in a bulk crystal. Nature physics, 7(2), 138-141
[2] Vampa, G., Hammond, T. J., Thiré, N., Schmidt, B. E., Légaré, F., McDonald, C. R., ... & Corkum, P. B. (2015). All-optical reconstruction of crystal band structure. Physical review letters, 115(19), 193603.
[3] Liu, H., Li, Y., You, Y. S., Ghimire, S., Heinz, T. F., & Reis, D. A. (2017). High-harmonic generation from an atomically thin semiconductor. Nature Physics, 13(3), 262-265.
[4] Luu, T. T., & Wörner, H. J. (2018). Measurement of the Berry curvature of solids using high-harmonic spectroscopy. Nature communications, 9(1), 1-6.
[5] Bionta, M. R., Haddad, E., Leblanc, A., Gruson, V., Lassonde, P., Ibrahim, H., ... & Légaré, F. Tracking ultrafast solid-state dynamics using high harmonic spectroscopy. Physical Review Research, 3(2), 023250, 2021
[6] Neufeld, O., Zhang, J., De Giovannini, U., Hubener, H., & Rubio, A. (2022). Probing phonon dynamics with multi-dimensional high harmonic carrier envelope phase spectroscopy. Proceedings of the National Academy of Sciences, 119(25):e2204219119
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