Fig. 4: Pump photon energy dependence of the hot spot.
From: Manipulating the symmetry of photon-dressed electronic states
a–d TrARPES dispersion images measured at Δt = 0 with different pump photon energies. The red and black arrows point to the hot spot and CB, respectively. e–h Energy distribution curves at k = 0 with different pump photon energies, which are correspondingly extracted from the data in (a–d). i Extracted energy positions of the hot spot relative to the energy of VBM as a function of pump photon energy. The red dashed line corresponds to E = hν. The error bar of the energy position is defined as the upper limit when the energy position is clearly offset from the peak, and the error bar of the photon energy is defined by the wavelength deviation between the setting and real values of non-collinear differential frequency generation (NDFG). j A schematic drawing to illustrate that the hot spot is the Floquet replica of VBM.
