Figure 2

Examples of the incident SR spectrum, sample response function, and response function of the nuclei in the emitters. (Top) The spectrum in the angular frequency domain \({|{\hat{E}}_{0}(\omega )|}^{2}\) and the time spectrum |E ₀(t)|² of the incident SR are shown. (Middle) The dynamic structure factor \(\hat{S}({\boldsymbol{q}},\omega )={|\hat{g}({\boldsymbol{q}},\omega )|}^{2}\) is drawn, showing a central peak with FWHM of Γ and side-band peaks that originated from the lattice vibrations, where g is the response function of the sample (see the main text for details). The corresponding intermediate scattering function S(q, t) = 〈g ^*(q, t)g(q, 0)〉 is also shown. Here, \(\langle \cdots \rangle \) denotes a correlation function. (Bottom) For the response function of the nuclei in the emitters, the spectrum of \({|\hat{G}(\omega )|}^{2}\) in the angular frequency domain is shown for the condition with two peaks with energy splitting of δE. In the time domain, the corresponding |G(t)|² showing the QB with a period of δT is drawn.