Dirac node arcs in PtSn4

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Wang, Lin-Lin
Mun, Eundeok
Johnson, Duane
Mou, Daixiang
Lee, Youngbin
Bud’ko, Serguei
Canfield, Paul
Kaminski, Adam
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Canfield, Paul
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Johnson, Duane
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Physics and Astronomy
Physics and astronomy are basic natural sciences which attempt to describe and provide an understanding of both our world and our universe. Physics serves as the underpinning of many different disciplines including the other natural sciences and technological areas.
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Materials Science and Engineering
Materials engineers create new materials and improve existing materials. Everything is limited by the materials that are used to produce it. Materials engineers understand the relationship between the properties of a material and its internal structure — from the macro level down to the atomic level. The better the materials, the better the end result — it’s as simple as that.
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Ames National LaboratoryPhysics and AstronomyMaterials Science and Engineering

In topological quantum materials1–3 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 semimetals4–8 . 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.


This is a manuscript of an article published as Yun Wu, Lin-Lin Wang, Eundeok Mun, D. D. Johnson, Daixiang Mou, Lunan Huang, Yongbin Lee, S. L. Bud’ko, P.C. Canfield, and Adam Kaminski, “Dirac Node Arcs in PtSn4,” Nature Physics 12, 667-671 (2016). DOI: 10.1038/NPHYS3712. Posted with permission.

Fri Jan 01 00:00:00 UTC 2016