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, ‡,}

Intentional cleavage of the (001) and (100) surfaces of the Na₃Bi crystals. (a) Sketch of the intentional cutting process of the Na₃Bi single crystal to cleave at the desired (001) and (100) surfaces. (b) Photo of the cleaved (001) surface taken after ARPES measurements. (c) Photo of the cleaved (100) surface taken after ARPES measurements. (d) Schematic atomic structure of the (001) surface. (e) Schematic atomic structure of the (100) surface. (f) Large momentum space Fermi surface mapping on the (001) surface of Na₃Bi using 21.2 eV photon energy. (g) Large momentum space Fermi surface mapping of the (100) surface of Na₃Bi using 21.2 eV photon energy.