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Santanu Mandal

Single-cycle probing of the dynamics of the insulator-to-metal phase transition in VO₂

Universität Rostock, 11.06.2025

https://doi.org/10.18453/rosdok_id00005659

Abstract: This thesis uses single-cycle and few-cycle femtosecond pulses to explore two major frontiers in condensed-matter and strong-field physics. First, single-cycle excitation clarifies the insulator-to-metal transition mechanism in M1-VO₂ by separating electronic and structural dynamics and revealing the anharmonic V–V bond oscillation central to the phase change. Second, it details the development of a solid-state high harmonic spectroscopy apparatus that enables precise study of the transition from perturbative to nonperturbative or extreme nonlinear optics in bulk crystals for the first time.

doctoral thesis   free access