Fig. 3: Temperature dependence of phonon frequency combs in CrGeTe3.
From: Spontaneously formed phonon frequency combs in van der Waals solid CrGeTe3 and CrSiTe3
a, b Temperature dependence of the \({A}_{{{{\rm{g}}}}}^{5}\) mode, with 633 nm and 532 nm lasers respectively. c Peak profile fitting results at different temperatures of the 532 nm data. d Detailed temperature dependence of the peak positions (red dots) and FWHMs (red shading) of the fitting result in (c). e Fitting of the temperature dependence of the energy “weighted average” using thermal expansion data (Used with permission of IOP Publishing, Ltd, from Crystallographic, magnetic and electronic structures of a new layered ferromagnetic compound Cr2Ge2Te6. Carteaux et al.23; permission conveyed through Copyright Clearance Center, Inc.) and FWHMs using Eq. (1), the blue and red solid lines show the fitting with the whole dataset, while the black line shows the fitting with only T ≥ 65K data. Error bars in (d) and (e) represent one standard deviation.
