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, ‡,}

Fermi surface and constant energy contours at different binding energies taken by 56 eV photons on the Na₃Bi (100) surface. (a) Two pairs of node-like Fermi surfaces along . The blue dashed rectangle is the (100) surface Brillouin zone derived directly from the crystal structure of Na₃Bi (Fig. 1(a)). The thick gray rectangle is the surface Brillouin zone defined by the results of the constant energy contours. In this case, the unit cell of the surface Brillouin zone is doubled along the direction while it remains the same along the direction. (b)–(h) Constant energy contours at different binding energies taken on the (100) surface of Na₃Bi.