同步辐射及其在无机材料中的应用进展

刘云鹏, 盛伟繁, 吴忠华

Synchrotron Radiation and Its Applications Progress in Inorganic Materials

LIU Yunpeng, SHENG Weifan, WU Zhonghua

图15 ARPES揭示的p-SnSe的电子结构[60]

Fig. 15 Electronic structure of p-SnSe resolved by ARPES[60] ARPES measures band dispersions along high-symmetry directions of Z-Γ-Z (a), U-Y-U (b), and Y-Γ-Y (c), taken with 50 eV photon energy. The second derivative plots (d) and (e), corresponding to (a) and (b), respectively, directly compared with the DFT calculations, in which the weight of Sn5s and Se4p orbitals are represented by light blue and yellow, respectively; Close-up of the top VBs along Γ-Z reveals pronounced differences between the theoretical band dispersion (f) and the ARPES measured results (g), as highlighted by the X-shaped dashed lines; (h) Schematic plot of a pudding-moul shaped VB with corrugations, which leads to giant S due to the band geometry effect with inset showing the ARPES cut directions in the projected two-dimensional first Brillouin zone (BZ) (1 Å=0.1 nm)