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Electronic structure, Dirac points and Fermi arc surface states in three-dimensional Dirac semimetal Na_3Bi from angle-resolved photoemission spectroscopy

引用

Chinese Physics B 2016年第7期25卷 76-88页

作者：梁爱基陈朝宇王志俊石友国冯娅伊合绵谢卓晋何少龙何俊峰彭莹莹刘艳刘德发胡成赵林刘国东董晓莉张君 m nakatake H Iwasawa K Shimad m Arita H Namatame m Taniguchi 许祖彦陈创天翁红明戴希方忠周兴江 Beijing National Laboratory for Condensed matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China Hiroshima Synchrotron Radiation Center Hiroshima University 2-313 Kagamiyama Higashi-Hiroshima City 739-0046 Japan Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 China Collaborative Innovation Center of Quantum matter Beijing China

The three-dimensional（3D） Dirac semimetals have linearly dispersive 3D Dirac nodes where the conduction band and valence band are connected. They have isolated 3D Dirac nodes in the whole Brillouin zone and can be viewed as a 3D counterpart of graphene. Recent theoretical calculations and experimental results indicate that the 3D Dirac semimetal state can be realized in a simple stoichiometric compound A3Bi（A = Na, K, Rb）. Here we report comprehensive high-resolution angle-resolved photoemission（ARPES） measurements on the two cleaved surfaces,（001） and（100）, of Na3Bi. On the（001） surface, by comparison with theoretical calculations, we provide a proper assignment of the observed bands, and in particular, pinpoint the band that is responsible for the formation of the three-dimensional Dirac cones. We observe clear evidence of 3D Dirac cones in the three-dimensional momentum space by directly measuring on the kx–ky plane and by varying the photon energy to get access to different out-of-plane kzs. In addition, we reveal new features around the Brillouin zone corners that may be related with surface reconstruction. On the（100） surface, our ARPES measurements over a large momentum space raise an issue on the selection of the basic Brillouin zone in the（100） plane. We directly observe two isolated 3D Dirac nodes on the（100） surface. We observe the signature of the Fermi-arc surface states connecting the two 3D Dirac nodes that extend to a binding energy of ~150 me V before merging into the bulk band. Our observations constitute strong evidence on the existence of the Dirac semimetal state in Na3Bi that are consistent with previous theoretical and experimental work. In addition, our results provide new information to clarify on the nature of the band that forms the3 D Dirac cones, on the possible formation of surface reconstruction of the（001） surface, and on the issue of basic Brillouin zone selection for the（100） surface.

关键词： Dirac semimetal Na3Bi photonemission surface state

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