@article{d475cce64ed346dba99dca4b2439015d,
title = "Topological nodal-line fermions in spin-orbit metal PbTaSe2",
abstract = "Topological semimetals can support one-dimensional Fermi lines or zero-dimensional Weyl points in momentum space, where the valence and conduction bands touch. While the degeneracy points in Weyl semimetals are robust against any perturbation that preserves translational symmetry, nodal lines require protection by additional crystalline symmetries such as mirror reflection. Here we report, based on a systematic theoretical study and a detailed experimental characterization, the existence of topological nodal-line states in the non-centrosymmetric compound PbTaSe2 with strong spin-orbit coupling. Remarkably, the spin-orbit nodal lines in PbTaSe2 are not only protected by the reflection symmetry but also characterized by an integer topological invariant. Our detailed angle-resolved photoemission measurements, first-principles simulations and theoretical topological analysis illustrate the physical mechanism underlying the formation of the topological nodal-line states and associated surface states for the first time, thus paving the way towards exploring the exotic properties of the topological nodal-line fermions in condensed matter systems.",
author = "Guang Bian and Chang, {Tay Rong} and Raman Sankar and Xu, {Su Yang} and Hao Zheng and Titus Neupert and Chiu, {Ching Kai} and Huang, {Shin Ming} and Guoqing Chang and Ilya Belopolski and Sanchez, {Daniel S.} and Madhab Neupane and Nasser Alidoust and Chang Liu and Wang, {Bao Kai} and Lee, {Chi Cheng} and Jeng, {Horng Tay} and Chenglong Zhang and Zhujun Yuan and Shuang Jia and Arun Bansil and Fangcheng Chou and Hsin Lin and Hasan, {M. Zahid}",
note = "Funding Information: Work at Princeton University and Princeton-led synchrotron-based ARPES measurements were supported by the US Department of Energy (DOE)/Basic Energy Sciences under DE-FG-02-05ER46200. We gratefully acknowledge C.M. Polley, J. Adell, M. Leandersson and T. Balasubramanian for their beamline assistance at the Max-lab. We also thank A.P. Schnyder, C. Fang and M. Franz for discussions. The work at the Northeastern University was supported by the USDOE, Office of Science BES grant number DE-FG02-07ER46352, and was benefited from Northeastern University{\textquoteright}s Advanced Scientific Computation Center (ASCC) and the NERSC supercomputing centre through DOE grant number DE-AC02-05CH11231. S.J. acknowledges National Basic Research Program of China under Grant Nos 2013CB921901 and 2014CB239302. H.L. acknowledges the Singapore National Research Foundation for the support under NRF Award No. NRF-NRFF2013-03. F.C. acknowledges the support provided by the Ministry of Science and Technology in Taiwan under project number MOST-102-2119-M-002-004. R.S. and F.C. acknowledge the support provided by the Academia Sinica research programme on nanoscience and nanotechnology project number NM004. T.-R.C. and H.-T.J. were supported by the National Science Council, Taiwan. H.-T.J. also thanks the National Center for High-Performance Computing, Computer and Information Network Center National Taiwan University and National Center for Theoretical Sciences, Taiwan, for technical support. Sample characterization was supported by the Gordon and Betty Moore Foundations-Emergent Phenomena in Quantum Systems Initiative through grant GBMF4547 (M.Z.H.). Publisher Copyright: {\textcopyright} 2016, Nature Publishing Group. All rights reserved.",
year = "2016",
month = feb,
day = "2",
doi = "10.1038/ncomms10556",
language = "English (US)",
volume = "7",
journal = "Nature Communications",
issn = "2041-1723",
publisher = "Nature Publishing Group",
}