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Dirac node arcs in PtSn4

TitleDirac node arcs in PtSn4
Publication TypeJournal Article
Year of Publication2016
AuthorsWu, Y, Wang, LL, Mun, E, Johnson, DD, Mou, DX, Huang, LN, Lee, Y, Bud'ko, SL, Canfield, PC, Kaminski, A
JournalNature Physics
Date Published07
Type of ArticleArticle
ISBN Number1745-2473
Accession NumberWOS:000379269900023
Keywordscd3as2, discovery, magnetoresistance, physics, surface, ultrahigh mobility, weyl fermion semimetal

In topological quantum materials(1-3) the conduction and valence bands are connected at points or along lines in the momentum space. A number of studies have demonstrated that several materials are indeed Dirac/Weyl semimetals(4-8). However, there is still no experimental confirmation of materials with line nodes, in which the Dirac nodes form closed loops in the momentum space(2,3). Here we report the discovery of a novel topological structure-Dirac node arcs-in the ultrahigh magnetoresistive material PtSn4 using laser-based angle-resolved photoemission spectroscopy data and density functional theory calculations. Unlike the closed loops of line nodes, the Dirac node arc structure arises owing to the surface states and resembles the Dirac dispersion in graphene that is extended along a short line in the momentum space. We propose that this reported Dirac node arc structure is a novel topological state that provides an exciting platform for studying the exotic properties of Dirac fermions.

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Alternate JournalNat. Phys.