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Observation of Weyl nodes and Fermi arcs in tantalum phosphide.

Abstract：

:A Weyl semimetal possesses spin-polarized band-crossings, called Weyl nodes, connected by topological surface arcs. The low-energy excitations near the crossing points behave the same as massless Weyl fermions, leading to exotic properties like chiral anomaly. To have the transport properties dominated by Weyl fermions, Weyl nodes need to locate nearly at the chemical potential and enclosed by pairs of individual Fermi surfaces with non-zero Fermi Chern numbers. Combining angle-resolved photoemission spectroscopy and first-principles calculation, here we show that TaP is a Weyl semimetal with only a single type of Weyl fermions, topologically distinguished from TaAs where two types of Weyl fermions contribute to the low-energy physical properties. The simple Weyl fermions in TaP are not only of fundamental interests but also of great potential for future applications. Fermi arcs on the Ta-terminated surface are observed, which appear in a different pattern from that on the As-termination in TaAs and NbAs.

journal_name

Nat Commun

journal_title

Nature communications

authors

Xu N,Weng HM,Lv BQ,Matt CE,Park J,Bisti F,Strocov VN,Gawryluk D,Pomjakushina E,Conder K,Plumb NC,Radovic M,Autès G,Yazyev OV,Fang Z,Dai X,Qian T,Mesot J,Ding H,Shi M

doi

10.1038/ncomms11006

subject

Has Abstract

pub_date

2016-03-17 00:00:00

pages

11006

issn

2041-1723

pii

ncomms11006

journal_volume

7

pub_type

杂志文章

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