Seminar by Arshak Tsaturyan : "Ab initio simulations of silica electron structure under strong laser-induced excitation"

"Ab initio simulations of silica electron structure under strong laser-induced excitation"

Abstract

Silica is an indispensable material in emergent photonic applications due to its unique optical, mechanical, and thermal properties, especially when nano-structured by an ultrashort laser pulse. The precision of laser-induced modifications relies heavily on controlling electron excitations and transient optical properties during the laser pulse. Fused silica glass is represented using a system of (SiO₄)⁴⁻ tetrahedra, where Density Functional Theory extended to finite-temperature fractional occupation reproduces ground and photoexcited states. Electronic properties, such as electronic specific heat, deformation potential, effective electron mass, and electron-phonon coupling, were evaluated using GW and DFPT approximations. The mechanism for self-trapped exciton formation was modeled using finite-temperature DFT and TD-DFT."

Details of presenter: Dr. Arshak A. Tsaturyan received his Ph.D. in Physical Chemistry in 2014 from the Southern Federal University, under the supervision of Prof. V. A. Kogan. He had a fellowship at the University of Turin with Prof. C. Barolo. He joined the Laboratoire Hubert Curien in 2021 for a postdoctoral research position and is working with Prof. JP. Colombier, Dr. E. Kachan and Prof. R. Stoian. Arshak A. Tsaturyan has co-authored more than 50 publications in peer-reviewed journals.

This seminar will be held in English.