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| 1 | Electronic structure, Dirac points and Fermi arc surface states in three-dimensional Dirac semimetal Na_3Bi from angle-resolved photoemission spectroscopy显示文摘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. | 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 | 2016 | Chinese Physics B2016，25，7： | 1 |
| 2 | Photodynamic therapy of C6-implanted glioma cells in the rat brain employing second-generation photosensitizer talaporfin sodium 显示文摘 | Namatame H Akimoto J Matsumura H | 2008 | Photodiagnosis Photodyn Ther2008，5，3： | 1 |
| 3 | A multi-institutional prospective study of lentinan in advanced gastric cancer patients with unresectable and recurrent diseases: effect on prolongation of survival and improvement of quality of life显示文摘 | Nakano H Namatame K Nemoto H | 1999 | Hepatogastroemterology1999，46，28： | 1 |
| 4 | The evaluation of cellular proliferating activity in gastric carcinoma with the proliferating cell nuclear antigen(PCNA) expressive rate:its foundmental examination of the immunohistochemical procedures and its clinical applications显示文摘 | Nakano H Namatame K Nakayoshi A | 1993 | Nippon Gaka Gakkai Zasshi1993，94，6： | 1 |
| 5 | In vitro antitrypano-somal activity of bis(bibenzyls)s and bibenzyls from liver-worts against Trypanosoma brucei显示文摘 | Otoguro K Ishiyama A Iwatsuki M Namatame M Nishi-hara-Tukashima A Kiyohara H | 2012 | J Nat Med2012，66，2： | 1 |
| 6 | The evaluation of proliferating activity in gastric carcinoma stained by proliferating cell nuclear antigen (PCNA) 显示文摘 | Namatame K Suzuki T | 1992 | Nippon Geka Gakkai Zasshi1992，93，2： | 1 |
| 7 | The evaluation of cellular proliferating activity in grastric carcinoma with PCNA expression rate: its foundmental examination of the immunohistochemical procedures and its clinical applications 显示文摘 | Nakano H Namatame Nadayoshi | 1993 | Nippon Gakkai Zasshi1993，94，6： | 1 |
| 8 | A multi-institutional prospective study of lentinan in advanced gastric cancer patients with unresetable and recurrent disease: effect on prolongation of survial and improvement of quality of life 显示文摘 | Nakano H Namatame K Nemoto H | 1999 | Hepatagastroemterology1999，46，28： | 1 |
| 9 | Role of electronic structure in the martensitic phase transition of Ni2Mn1+xSn1-x studied by hard-X-ray photoelectron spectroscopy and ab initio calculation 显示文摘 | YE M KIMURA A SHIRAI M CUI Y T SHIMADA K NAMATAME H TANIGUCHI M UEDA S KOBAYASHI K KAINUMA R SHISHIDO T FUKUSHIMA K KANOMATA T | 2010 | Physical Review Letters2010，104，： | 1 |
| 10 | Efficacy of intraportal injection of anti-ICAM-1 monoclonal antibody against liver cell injury following warm ischemia in the rat显示文摘 | KUZUME M NAMATAME K | 1995 | Am J Surg1995，170，1： | 1 |
| 11 | Efficacy of intraportal injection of anti ICAM-1 monoclonal antibody against liver cell injury following warm ischemia in the rat显示文摘 | Nakano H Kuzume M Namatame K | 1995 | Am J Surg1995，170，： | 1 |
| 12 | Amultiinstitutional prospective study of lentinan in advanced gastric cancer patients with unresectable and recurrent diseases: effect on prolongation of survival and improvement of quality of life显示文摘 | Nakano H Namatame K Nemoto H | 1999 | Hepotogastroenterology1999，46，： | 1 |
| 13 | Anti-plasmodial activity of bisbenzylisoquinoline alkaloids fromMichelia figo leaves显示文摘 | Phrutivorapongkul A Ichino C Ruangrungsi N Ishiyama A Sekiguchi H Namatame M Kiyohara H Otoguro K Yamada H Omura S | 2006 | Thai J Health Res2006，20，2： | 1 |
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