Dirac node arcs in PtSn4

By A. Kaminski, Paul C. Canfield, S. Bud’ko, D. Mou, E. Mun, Yun Wu, Lunan Huang, Yongbin Lee, Duane D. Johnson, Lin‐Lin Wang. Nature Physics, 2016

242 citations recorded by the source corpus.

A combination of detailed photoelectron spectroscopy measurements and numerical simulations reveal the presence of so-called Dirac node arcs in the electronic structure of PtSn4. In topological quantum materials1,2,3 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 semimetals4,5,6,7,8. However, there is still no experimental confirmation of materials with line nodes, in which the Dirac nodes form closed loops in the momentum space2,3. 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.

Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/3a9c334814870a43e499bbc5bb2a71b5bc43782c

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In Atomic and Molecular Physics, and Optics

In Materials Chemistry

Citations in the corpus

Unconventional mass enhancement around the Dirac nodal loop in ZrSiS (2017, background): “In non-centrosymmetric PbTaSe 2 , strong spin-orbit coupling leads to the creation of nodal rings which have been conﬁrmed by angle-resolved photoemission spectroscopy (ARPES) [10] while in PtSn 4 , ARPES has revealed a Dirac nodal arc structure that has been attributed to surface states [9].”