Our latest publication on high harmonic generation is in Communications Physics (Nature Publishing Group)

Researchers from Charles University and HiLASE Centre have published a joint study on the emission of high harmonics emitted by silicon crystal when irradiated by a few-cycle laser pulse. In this work, the group of Martin Kozak (Charles University) measured the energy of photons emitted during the irradiation in the reflection geometry. This enabled to perform a direct comparison with the predictions based on the time-dependent density functional theory (TDDFT), prepared by Thibault Derrien (HiLASE Centre).

The paper evidences the importance of the carrier-envelope phase and of the crystal’s orientation when using ultrashort pulses. The study supports the importance of Van Hove singularities in the angular distribution of the emitted harmonics. Overall, this work demonstrates that quantum approaches and supercomputing are essential for the development of modern laser technologies.

The paper is available at the following address

Journal: Communications Physics (IF 6.459)

Title: Role of Van Hove singularities and effective mass anisotropy in polarization-resolved high harmonic spectroscopy of silicon

Authors: Suthar, P.; Trojánek, F.; Malý, P.; Derrien, T. J.-Y. & Kozák, M.

TJY Derrien attended Benasque TDDFT conference

T. J.-Y. Derrien attended the “9th Time-Dependent Density-Functional Theory workshop: prospects and applications”, held in Benasque (Spain) from Oct. 24th to Oct. 28th. The workshop gathers actors of the TDDFT community and first-principle computations of laser-irradiated materials.

Dr. Derrien presented results on the modification of band structure of solids upon excitation by intense laser light, developed in the context of the WP1-WP2 of the project BIATRI: No. CZ.02.1.01/0.0/0.0/15_003/0000445 and WP5 of Marie Curie RISE ATLANTIC project No. 823897 (www.atlantic-rise.eu).

Website of the conference