Ultrafast Transition from State-Blocking Dynamics to Electron Localization in Transition Metal β-Tungsten

We describe an ultrafast transition of the electronic response of optically excited transition metal β-tungsten with few-femtosecond time resolution. The response moves from a regime where state filling of the excited carrier population around the Fermi level dominates towards localization of carrie...

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Bibliographic Details
Published in:Physical review letters 2023-12, Vol.131 (22), p.226901-226901, Article 226901
Main Authors: de Vos, E W, Neb, S, Niedermayr, A, Burri, F, Hollm, M, Gallmann, L, Keller, U
Format: Article
Language:English
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Summary:We describe an ultrafast transition of the electronic response of optically excited transition metal β-tungsten with few-femtosecond time resolution. The response moves from a regime where state filling of the excited carrier population around the Fermi level dominates towards localization of carriers onto the outer d orbitals. This is in contrast to previous measurements using ultrafast element-specific core-level spectroscopy enabled by attosecond transient absorption spectroscopy on transition metals such as titanium and around the transition metal atom in transition metal dichalchogenides MoTe_{2} and MoSe_{2}. This surprisingly different dynamical response for β-tungsten can be explained by considering the electron-electron dynamics on a few-femtosecond timescale and the slower electron-phonon thermalization dynamics.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.131.226901