Time-reversal Symmetry Breaking Type-II Weyl State in YbMnBi

Overview

Journal Nat Commun

Specialty Biology

Date 2019 Aug 2

PMID 31366883

Citations 20

Authors

Sergey Borisenko

Daniil Evtushinsky

Quinn Gibson

Alexander Yaresko

Klaus Koepernik

Timur Kim

Mazhar Ali

Jeroen van den Brink

Moritz Hoesch

Alexander Fedorov

Erik Haubold

Yevhen Kushnirenko

Ivan Soldatov

Rudolf Schafer

Robert J Cava

Affiliations

Soon will be listed here.

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, YbMnBi. 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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