Year: 2019
Type: article
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 2 . 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.
Source: Nature Communications
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 Schäfer, Robert J. Cava
Institutions: Leibniz Institute for Solid State and Materials Research, École Polytechnique Fédérale de Lausanne, University of Liverpool, Princeton University, Max Planck Institute for Solid State Research, Diamond Light Source, Technische Universität Dresden, Deutsches Elektronen-Synchrotron DESY, Ural Federal University
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $5,200
OpenAlex ID: W2322404890