Abstract

Previous Attosecond Transient Absorption Spectroscopy studies on the transition metal Titanium and transition metal dichalcogenides (TMDCs) MoTe2 and MoSe2 have revealed element specific screening and state-blocking dynamics on ultrafast timescales after excitation by a femtosecond NIR pump pulse [1 - 3]. For Titanium the response followed the pump fluence and was dominated by the localization of the excited electron population into its valence 3d orbitals. A similar result was seen for studies on the TMDCs MoTe2 and MoSe2, where the response originating from the transition metal Molybdenum showed this localization effect, whereas the response from the chalcogenides was dominated by state-blocking of the excited carriers around the Fermi energy. These studies have highlighted the universality of the localization response of optically excited transition metals.

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