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Topological nodal-line fermions in spin-orbit metal PbTaSe2

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms10556· OSTI ID:1311503

Here we discuss how 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.

Research Organization:
Northeastern Univ., Boston, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
FG02-07ER46352
OSTI ID:
1311503
Journal Information:
Nature Communications, Journal Name: Nature Communications Vol. 7; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Weyl-link semimetals text January 2017
Coexistence of four-band nodal rings and triply-degenerate nodal points in centrosymmetric metal diborides text January 2017
Nodal-knot semimetals text January 2017
Weyl and Dirac Semimetals in Three Dimensional Solids text January 2017
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Type-II nodal loops: theory and material realization text January 2017
Transport and optics at the node in a nodal loop semimetal text January 2017
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Demonstration of Hopf-link semimetal bands with superconducting circuits text January 2017
Weyl points of mechanical diamond text January 2018
Topological nodal-line semimetals in ferromagnetic rare-earth-metal monohalides text January 2018
Non-Abelian band topology in noninteracting metals text January 2018
Weak Localization and Antilocalization in Nodal-Line Semimetals: Dimensionality and Topological Effects text January 2019
Topological bound states for quantum charges text January 2019
Exploring Topological Superconductivity in Topological Materials text January 2019
Angle-dependent magnetoresistance and its implications for Lifshitz transition in W2As3 text January 2020
Non-Abelian band topology in noninteracting metals text January 2019

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