Fig. 2: Temperature dependence of the charge density wave modulations.
a–c Fourier transform (FT) linecuts of the dI/dV map acquired at 40 mV, starting from the center of the FT, through the three CDW peaks: (a) q1CDW, (b) q2CDW, and (c) q3CDW on sample 1. Suppression of the CDW peaks is apparent with increasing temperature. Insets in (a–c) show the relevant portion of the FT, with the corresponding wave vector that is plotted circled. d Plot of the background-subtracted height (FT amplitude) of the Gaussian fits to each peak in the temperature-dependent linecuts in (a–c). Blue, red and green lines represent linear visual guides for each of the three CDW peak amplitude dispersions, which seem to approach zero amplitude at about 10 K. e, f FT of dI/dV map acquired at 50 mV on sample 2 at (e) 4.8 K and (f) 10 K (same scale used for both). The positions of three CDW peaks are circled. g–i FT linecuts, starting from the center of the FT through each of the three CDW peaks, as a function of energy at 4.8 K. j Linear fit of FT peak height of q2CDW as a function of temperature extracted from (e, f). k–m FT linecuts, starting from the center of the FT through each of the three CDW peaks, as a function of energy at 10 K. q1CDW and q3CDW cannot be resolved at 10 K, while q2CDW still shows up with weakened magnitude. Scale bar is the same for (g–i, k–m). STM setup condition: Vsample = −50 mV, Iset = 300 pA, Vexc = 10 mV (e–m).
