Observation of Fermi arc surface states in a topological metal

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Abstract
Nailing down the topology of a semimetal: Topological insulators are exotic materials that have a conducting surface state that can withstand certain types of material imperfection. Theoreticians have predicted a different kind of surface state in related three-dimensional topological Dirac semimetals, which do not have an energy gap in the band structure of the bulk. Xu et al. used photoemission spectroscopy to map out the band structure of the material Na 3 Bi and detected the predicted surface state. Their results may lead to further insights into the physics of topological matter. Science , this issue p. 294
Funding Information
  • U.S. Department of Energy (DE-FG-02-05ER46200)
  • Army Research Office (W911NF-12-1-0461)
  • Ministry of Science and Technology (103-2112-M-110-008-MY3)
  • Singapore National Research Foundation (NRF-NRFF2013-03)
  • National Science Council, Taiwan
  • National Center for High-Performance Computing, Taiwan
  • Computer and Information Network Center-National Taiwan University, Taiwan
  • National Center for Theoretical Sciences, Taiwan
  • MOST-Taiwan (103-2119-M-002-020-MY3)

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