Prediction and observation of an antiferromagnetic topological insulator

Publikation: Beitrag in FachzeitschriftForschungsartikelBeigetragenBegutachtung

Beitragende

  • M. M. Otrokov - , Centro de Fisica de Materiales CFM/MPC (CSIC-UPV/EHU), Ikerbasque Basque Foundation for Science, Donostia International Physics Center, St. Petersburg State University (Autor:in)
  • I. I. Klimovskikh - , St. Petersburg State University (Autor:in)
  • H. Bentmann - , Julius-Maximilians-Universität Würzburg (Autor:in)
  • D. Estyunin - , St. Petersburg State University (Autor:in)
  • A. Zeugner - , Juniorprofessur Synthese und Kristallzüchtung von Quantenmaterialien (Autor:in)
  • Z. S. Aliev - , Baku State University, Azerbaijan State Oil and Industry University (Autor:in)
  • S. Gaß - , Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden (Autor:in)
  • A. U.B. Wolter - , Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden (Autor:in)
  • A. V. Koroleva - , St. Petersburg State University (Autor:in)
  • A. M. Shikin - , St. Petersburg State University (Autor:in)
  • M. Blanco-Rey - , Donostia International Physics Center, University of the Basque Country (Autor:in)
  • M. Hoffmann - , Johannes Kepler Universität Linz (Autor:in)
  • I. P. Rusinov - , St. Petersburg State University, Tomsk State University (Autor:in)
  • A. Yu Vyazovskaya - , St. Petersburg State University, Tomsk State University (Autor:in)
  • S. V. Eremeev - , St. Petersburg State University, Tomsk State University, RAS - Institute of Strength Physics and Materials Science, Siberian Branch (Autor:in)
  • Yu M. Koroteev - , Tomsk State University, RAS - Institute of Strength Physics and Materials Science, Siberian Branch (Autor:in)
  • V. M. Kuznetsov - , Tomsk State University (Autor:in)
  • F. Freyse - , Helmholtz-Zentrum Berlin für Materialien und Energie (HZB) (Autor:in)
  • J. Sánchez-Barriga - , Helmholtz-Zentrum Berlin für Materialien und Energie (HZB) (Autor:in)
  • I. R. Amiraslanov - , Baku State University (Autor:in)
  • M. B. Babanly - , Azerbaijan National Academy of Sciences (Autor:in)
  • N. T. Mamedov - , Baku State University (Autor:in)
  • N. A. Abdullayev - , Baku State University (Autor:in)
  • V. N. Zverev - , RAS - Institute of Solid State Physics (Autor:in)
  • A. Alfonsov - , Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden (Autor:in)
  • V. Kataev - , Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden (Autor:in)
  • B. Büchner - , Exzellenzcluster ct.qmat: Komplexität und Topologie in Quantenmaterialien, Professur für Experimentelle Festkörperphysik (gB/IFW), Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden (Autor:in)
  • E. F. Schwier - , Hiroshima University (Autor:in)
  • S. Kumar - , Hiroshima University (Autor:in)
  • A. Kimura - , Hiroshima University (Autor:in)
  • L. Petaccia - , Sincrotrone Trieste (Autor:in)
  • G. Di Santo - , Sincrotrone Trieste (Autor:in)
  • R. C. Vidal - , Julius-Maximilians-Universität Würzburg (Autor:in)
  • S. Schatz - , Julius-Maximilians-Universität Würzburg (Autor:in)
  • K. Kißner - , Julius-Maximilians-Universität Würzburg (Autor:in)
  • M. Ünzelmann - , Julius-Maximilians-Universität Würzburg (Autor:in)
  • C. H. Min - , Julius-Maximilians-Universität Würzburg (Autor:in)
  • Simon Moser - , Lawrence Berkeley National Laboratory (Autor:in)
  • T. R.F. Peixoto - , Julius-Maximilians-Universität Würzburg (Autor:in)
  • F. Reinert - , Julius-Maximilians-Universität Würzburg (Autor:in)
  • A. Ernst - , Johannes Kepler Universität Linz, Max Planck Institute of Microstructure Physics (Autor:in)
  • P. M. Echenique - , Centro de Fisica de Materiales CFM/MPC (CSIC-UPV/EHU), Donostia International Physics Center, University of the Basque Country (Autor:in)
  • A. Isaeva - , Juniorprofessur Synthese und Kristallzüchtung von Quantenmaterialien, Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden (Autor:in)
  • E. V. Chulkov - , Centro de Fisica de Materiales CFM/MPC (CSIC-UPV/EHU), Donostia International Physics Center, St. Petersburg State University, University of the Basque Country (Autor:in)

Abstract

Magnetic topological insulators are narrow-gap semiconductor materials that combine non-trivial band topology and magnetic order1. Unlike their nonmagnetic counterparts, magnetic topological insulators may have some of the surfaces gapped, which enables a number of exotic phenomena that have potential applications in spintronics1, such as the quantum anomalous Hall effect2 and chiral Majorana fermions3. So far, magnetic topological insulators have only been created by means of doping nonmagnetic topological insulators with 3d transition-metal elements; however, such an approach leads to strongly inhomogeneous magnetic4 and electronic5 properties of these materials, restricting the observation of important effects to very low temperatures2,3. An intrinsic magnetic topological insulator—a stoichiometric well ordered magnetic compound—could be an ideal solution to these problems, but no such material has been observed so far. Here we predict by ab initio calculations and further confirm using various experimental techniques the realization of an antiferromagnetic topological insulator in the layered van der Waals compound MnBi2Te4. The antiferromagnetic ordering that MnBi2Te4 shows makes it invariant with respect to the combination of the time-reversal and primitive-lattice translation symmetries, giving rise to a ℤ2 topological classification; ℤ2 = 1 for MnBi2Te4, confirming its topologically nontrivial nature. Our experiments indicate that the symmetry-breaking (0001) surface of MnBi2Te4 exhibits a large bandgap in the topological surface state. We expect this property to eventually enable the observation of a number of fundamental phenomena, among them quantized magnetoelectric coupling6–8 and axion electrodynamics9,10. Other exotic phenomena could become accessible at much higher temperatures than those reached so far, such as the quantum anomalous Hall effect2 and chiral Majorana fermions3.

Details

OriginalspracheEnglisch
Seiten (von - bis)416-422
Seitenumfang7
FachzeitschriftNature
Jahrgang576
Ausgabenummer7787
PublikationsstatusVeröffentlicht - 19 Dez. 2019
Peer-Review-StatusJa

Externe IDs

PubMed 31853084

Schlagworte

ASJC Scopus Sachgebiete