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Photoinduced dynamics of flat bands in the kagome metal CoSn

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arxiv 2305.09531 v1 pith:ECLZ2SGT submitted 2023-05-16 cond-mat.str-el cond-mat.mtrl-sci

Denny Puntel , Wibke Bronsch , Manuel Tuniz , Mingu Kang , Paul M. Neves , Shiang Fang , Efthimios Kaxiras , Joseph G. Checkelsky
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Riccardo Comin Fulvio Parmigiani Federico Cilento
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classification cond-mat.str-elcond-mat.mtrl-sci
keywords flatbandsbroadeningcosnkagomelocalizationphotoexcitationaffects
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CoSn is a prototypical kagome compound showing lattice-born flat bands with suppressed bandwidth over large parts of the Brillouin zone. Here, by means of time- and angle-resolved photoelectron spectroscopy, we provide direct evidence of the response to photoexcitation of the flat bands, that underlie information about localization in real space. In particular, we detect a sudden shift and broadening of the flat bands, while after one picosecond only a broadening survives. We ascribe both these effects to an ultrafast disruption of electron localization, which renormalizes the effective electron-electron interaction and affects the flat band dispersion. Since both variations are in the order of a few meV, our measurements suggest that the flat bands are resilient to near-infrared photoexcitation.

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