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Title: Topological nodal-line fermions in spin-orbit metal PbTaSe2
Authors: Bian, G
Chang, T.-R
Sankar, R
Xu, S.-Y
Zheng, H
Neupert, T
Chiu, C.-K
Huang, S.-M
Chang, G
Belopolski, I
Sanchez, D.S
Neupane, M
Alidoust, N
Liu, C
Wang, B 
Lee, C.-C 
Jeng, H.-T
Zhang, C
Yuan, Z
Jia, S
Bansil, A 
Chou, F
Lin, H 
Hasan, M.Z
Keywords: experimental study
numerical model
surface area
theoretical study
theoretical model
Issue Date: 2016
Publisher: Nature Publishing Group
Citation: Bian, G, Chang, T.-R, Sankar, R, Xu, S.-Y, Zheng, H, Neupert, T, Chiu, C.-K, Huang, S.-M, Chang, G, Belopolski, I, Sanchez, D.S, Neupane, M, Alidoust, N, Liu, C, Wang, B, Lee, C.-C, Jeng, H.-T, Zhang, C, Yuan, Z, Jia, S, Bansil, A, Chou, F, Lin, H, Hasan, M.Z (2016). Topological nodal-line fermions in spin-orbit metal PbTaSe2. Nature Communications 7 : 10556. ScholarBank@NUS Repository.
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. © 2016, Nature Publishing Group. All rights reserved.
Source Title: Nature Communications
ISSN: 20411723
DOI: 10.1038/ncomms10556
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