Fig. 5: Fourier amplitude modulation near ROI C.

a Close-up of the 0.23 THz Fourier map near ROI C. The data is overlaid with experimental band dispersions from ref. ¹¹. For better visibility of the Fourier amplitude modulation near ROI C, the spin split upper hole bands are kept semi-transparent in this region. The energy-momentum cut displayed in b is indicated. The Fourier map was generated from ARPES intensity maps that were binned over regions of 6 meV × 0.0025 Å⁻¹. b Fourier amplitude as a function of binding energy extracted from the Fourier map along the energy-momentum cut indicated in a. The separation of the amplitude maxima near ROI C is indicated. c–e Fourier amplitude and Fourier phase as a function of binding energy resulting from the simulations of c scenario (i), d scenario (ii), and e scenario (iii). The pictograms in the graphs schematically illustrate the considered scenarios. Details are given in the text and in Supplementary Note 10. The separation of the Fourier amplitude maxima for scenario (ii) is indicated. f Color-coded plot of experimental EDCs along the evaluated energy-momentum cut near ROI C as a function of Δt. The dashed lines mark the binding energies of the two Fourier amplitude maxima indicated in b. The top graph displays for comparison the PE intensity transient of ROI C.