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, ‡,}

Sample ageing effect on the Fermi surface and band structure of Na₃Bi. (a) Fermi surface measured by 56 eV photons on a fresh Na₃Bi (100) surface. (b) Fermi surface of the same (100) surface measured by 56 eV photons about 2 hours after cleaving. (c) Band structure measured on a fresh Na₃Bi (100) surface along the cut indicated by a red line in panel (a). (d) Band structure measured on an aged Na₃Bi (100) surface along the cut indicated by a red line in panel (b). An energy shift downward by ∼80 meV is observed that indicates a hole doping effect during the sample aging process in vacuum.