Time-reversal symmetry breaking type-II Weyl state in YbMnBi2

Nature Communications
Sergey BorisenkoRobert J Cava

Abstract

Spectroscopic detection of Dirac and Weyl fermions in real materials is vital for both, promising applications and fundamental bridge between high-energy and condensed-matter physics. While the presence of Dirac and noncentrosymmetric Weyl fermions is well established in many materials, the magnetic Weyl semimetals still escape direct experimental detection. In order to find a time-reversal symmetry breaking Weyl state we design two materials and present here experimental and theoretical evidence of realization of such a state in one of them, YbMnBi2. We model the time-reversal symmetry breaking observed by magnetization and magneto-optical microscopy measurements by canted antiferromagnetism and find a number of Weyl points. Using angle-resolved photoemission, we directly observe two pairs of Weyl points connected by the Fermi arcs. Our results not only provide a fundamental link between the two areas of physics, but also demonstrate the practical way to design novel materials with exotic properties.

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Citations

Jan 28, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Chunxu Bai, Yanling Yang
Jul 30, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Daniel SabsovichRoni Ilan
Sep 12, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Qi WangHechang Lei
Dec 10, 2020·Advanced Materials·Yu PanClaudia Felser
Apr 28, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Kota MatsumotoTomoteru Fukumura
Feb 16, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·A MohajeraniS A Jafari
Mar 7, 2020·Journal of the American Chemical Society·Sebastian KlemenzLeslie M Schoop

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Methods Mentioned

BETA
AFM
X-ray

Software Mentioned

Full Orbital
PY LMTO
LMTO

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