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Femtosecond laser pulses can be used to induce and simultaneously study nonequilibrium dynamics of different types of coherent excitations in solids. The coherent dynamics of the excitations of charge entities can construct real physical currents that they mimic sources of a new electromagnetic radiation whose frequency is determined by the time scale involved in the coherent dynamics of the excitations.Our group is interested in learning about light matter interaction at ultrafast time scales through THz pulse generation from solids and use it as a probing tool for investigating various intrinsic dynamical processes going on during and after the light matter interaction in technologically relevant material systems. In this talk, I will discuss a few results [1-3] on thin metallic film heterostructures and three-dimensional topological insulators and try to convey some of the above connections.
[1] Sandeep Kumar and Sunil Kumar, iScience 25, 104718 (2022).
[2] Sandeep Kumar and Sunil Kumar, Nature Communications 14, 8185 (2023).
[3] Anand Nivedan and Sunil Kumar, New Journal of Physics 26, 033044 (2024).
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