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 Shaolong1, †, 
, 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 Hongming1, 4, Dai Xi1, 4, Fang Zhong1, 4, Zhou Xing-Jiang1, 4, ‡,
, 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 Hongming1, 4, Dai Xi1, 4, Fang Zhong1, 4, Zhou Xing-Jiang1, 4, ‡, The three-dimensional bulk Dirac nodes and the Fermi arc surface states that connect the nodes on the (100) surface of Na3Bi. (a)–(f) The Fermi surface and constant energy contours at different binding energies measured using a photon enerngy of 56 eV on the (100) surface of Na3Bi. The red and gray dashed lines are sketched for the bulk Dirac nodes and surface states, respectively. Labels of BB and SS stand for the bulk bands and surface bands, respectively. The first surface Brillouin zone, defined directly by the real space crystal structure in Fig.
