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

DOI: 10.1038/s41467-019-11393-5

Authors: Sergey Borisenko (Leibniz IFW Dresden) , Daniil Evtushinsky (Leibniz IFW Dresden; Ecole Polytechnique Federale Lausanne) , Quinn Gibson (Princeton University; University of Liverpool) , Alexander Yaresko (Max-Planck-Institute for Solid State Research) , Klaus Koepernik (Leibniz IFW Dresden) , Timur Kim (Diamond Light Source) , Mazhar Ali (Princeton University) , Jeroen Van Den Brink (Leibniz IFW Dresden; TU Dresden) , Moritz Hoesch (Diamond Light Source) , Alexander Fedorov (IFW Dresden) , Erik Haubold (Leibniz IFW Dresden) , Yevhen Kushnirenko (Leibniz IFW Dresden) , Ivan Soldatov (Leibniz IFW Dresden; Ural Federal University) , Rudolf Schäfer (Leibniz IFW Dresden) , Robert J. Cava (Princeton University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Nature Communications , VOL 10

State: Published (Approved)
Published: July 2019
Diamond Proposal Number(s): 11643

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.

Journal Keywords: Electronic properties and materials; Topological insulators

Subject Areas: Physics, Materials


Instruments: I05-ARPES

Documents:
s41467-019-11393-5.pdf