Electronic structure, Dirac points and Fermi arc surface states in three-dimensional Dirac semimetal Na<sub>3</sub>Bi from angle-resolved photoemission spectroscopy

Electronic structure, Dirac points and Fermi arc surface states in three-dimensional Dirac semimetal Na₃Bi from angle-resolved photoemission spectroscopy

Liang Aiji¹, Chen Chaoyu¹, Wang Zhijun¹, Shi Youguo¹, Feng Ya¹, Yi Hemian¹, Xie Zhuojin¹, He Shaolong^{1, †,}, He Junfeng¹, Peng Yingying¹, Liu Yan¹, Liu Defa¹, Hu Cheng¹, Zhao Lin¹, Liu Guodong¹, Dong Xiaoli¹, Zhang Jun¹, Nakatake M², Iwasawa H², Shimada K², Arita M², Namatame H², Taniguchi M², Xu Zuyan³, Chen Chuangtian³, Weng Hongming^{1, 4}, Dai Xi^{1, 4}, Fang Zhong^{1, 4}, Zhou Xing-Jiang^{1, 4, ‡,}

Normal emission photoemission spectra (EDCs) measured on the (001) surface of Na₃Bi at different photon energies. (a) Normal emission EDCs taken with different incident photon energies from 48 eV to 116 eV. Red and blue colored EDCs with incident photon energies of 56 eV and 101 eV represent a repetition period that cover a complete Brillouin zone along k_z direction. (b) The corresponding EDC stacking image of panel (a) with proper normalization and interpolation. Apparently, the band repeats around photon energies of 56 eV and 101 eV as highlighted in both panels (a) and (b). The inner potential V₀ is thus estimated to be around 9.0 eV.