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Orbital complexity in intrinsic magnetic topological insulators MnBi4Te7 and MnBi6Te10

DOI: 10.1103/PhysRevLett.126.176403 DOI Help

Authors: R. C. Vidal (Universität Würzburg; Würzburg-Dresden Cluster of Excellence ct.qmat) , H. Bentmann (Universität Würzburg; Würzburg-Dresden Cluster of Excellence ct.qmat) , J. i. Facio (Leibniz Institute for Solid State and Materials Research (IFW) Dresden) , T. Heider (Peter Grünberg Institut, Forschungszentrum Jülich and JARA) , P. Kagerer (Universität Würzburg; Würzburg-Dresden Cluster of Excellence ct.qmat) , C. I. Fornari (Universität Würzburg; Würzburg-Dresden Cluster of Excellence ct.qmat) , T. R. F. Peixoto (University of Wuerzburg) , T. Figgemeier (Universität Würzburg; Würzburg-Dresden Cluster of Excellence ct.qmat) , S. Jung (Diamond Light Source; Gyeongsang National University) , Cephise Cacho (Diamond Light Source) , B. Büchner (Würzburg-Dresden Cluster of Excellence ct.qmat; Leibniz Institute for Solid State and Materials Research (IFW) Dresden; Technische Universität Dresden) , J. Van Den Brink (Würzburg-Dresden Cluster of Excellence ct.qmat; Leibniz Institute for Solid State and Materials Research (IFW) Dresden; Technische Universität Dresden) , C. M. Schneider (Peter Grünberg Institute, Forschungszentrum Jülich and Jülich-Aachen Research Alliance) , L. Plucinski (Peter Grünberg Institut, Forschungszentrum Jülich and JARA) , E. F. Schwier (Universität Würzburg; Würzburg-Dresden Cluster of Excellence ct.qmat; Hiroshima Synchrotron Radiation Center, Hiroshima University) , K. Shimada (Hiroshima Synchrotron Radiation Center, Hiroshima University) , M. Richter (Leibniz Institute for Solid State and Materials Research (IFW) Dresden; Technische Universität Dresden) , A. Isaeva (Würzburg-Dresden Cluster of Excellence ct.qmat; Leibniz Institute for Solid State and Materials Research (IFW) Dresden; Gyeongsang National University; University of Amsterdam) , F. Reinert (Universität Würzburg; Würzburg-Dresden Cluster of Excellence ct.qmat)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review Letters , VOL 126

State: Published (Approved)
Published: April 2021
Diamond Proposal Number(s): 22468

Abstract: Using angle-resolved photoelectron spectroscopy (ARPES), we investigate the surface electronic structure of the magnetic van der Waals compounds MnBi 4 Te 7 and MnBi 6 Te 10 , the n = 1 and 2 members of a modular ( Bi 2 Te 3 ) n ( MnBi 2 Te 4 ) series, which have attracted recent interest as intrinsic magnetic topological insulators. Combining circular dichroic, spin-resolved and photon-energy-dependent ARPES measurements with calculations based on density functional theory, we unveil complex momentum-dependent orbital and spin textures in the surface electronic structure and disentangle topological from trivial surface bands. We find that the Dirac-cone dispersion of the topologial surface state is strongly perturbed by hybridization with valence-band states for Bi 2 Te 3 -terminated surfaces but remains preserved for MnBi 2 Te 4 -terminated surfaces. Our results firmly establish the topologically nontrivial nature of these magnetic van der Waals materials and indicate that the possibility of realizing a quantized anomalous Hall conductivity depends on surface termination.

Journal Keywords: Electronic structure; Topological materials; Topological insulators

Subject Areas: Materials, Physics


Instruments: I05-ARPES

Other Facilities: Hiroshima Synchrotron Radiation Center

Added On: 12/05/2021 14:02

Discipline Tags:

Materials Science Quantum Materials Physics Hard condensed matter - electronic properties Magnetism Surfaces

Technical Tags:

Spectroscopy Angle Resolved Photoemission Spectroscopy (ARPES)