Figure 2
PE and IPE spectra of α-RuCl3.
The red and blue solid lines represent the density of states and the broadened one from LDA + SOC + U calculations, respectively. By comparing the experimental and theoretical results, we estimated the size of the band gap to be approximately 1.9 eV. Note that the crystal field splitting is underestimated in the LDA + SOC + U calculations. The top-left and top-right insets show source-flux dependence in PE and IPE spectra, respectively. The PE and IPE spectra are measured at the conditions (10 nA and electron incidence angle = 0°) under which charging effects are negligible.
