Line Plot from Scientific Research

Pump-induced changes in the MIR absorption (Δ α ) and the real part of the dielectric function (Δ ε 1 ) as a function of photon energy at a pump–probe delay time t pp = 4 ps for different temperatures T (colour coded; pump fluence, Φ NIR = 300 μJ cm –2 ). Curves are vertically offset for clarity. The spheres and the shaded areas represent the experimental and theoretical data, respectively. All right axes show the function ξ defined in the Methods. The vertical dashed lines track the maximum of Δ α and the corresponding zero crossing of Δ ε 1 , revealing an abrupt jump close to T N .

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