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Topology and magnetism in the Kondo insulator phase diagram

Michael Klett, Seulgi Ok, David Riegler, Peter Wölfle, Ronny Thomale, and Titus Neupert
Phys. Rev. B 101, 161112(R) – Published 21 April 2020
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Abstract

Topological Kondo insulators are a rare example of an interaction-enabled topological phase of matter in three-dimensional crystals—making them an intriguing but also hard case for theoretical studies. Here, we aim to advance our theoretical understanding by solving the paradigmatic two-band model for topological Kondo insulators using a fully spin-rotation invariant slave-boson treatment. Within a mean-field approximation, we map out the magnetic phase diagram and characterize both antiferromagnetic and paramagnetic phases by their topological properties. Among others, we identify an antiferromagnetic insulator that shows, for suitable crystal terminations, topologically protected hinge modes. Furthermore, Gaussian fluctuations of the slave-boson fields around their mean-field value are included in order to establish the stability of the mean-field solution through computation of the full dynamical susceptibility.

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  • Received 5 December 2019
  • Revised 17 February 2020
  • Accepted 24 March 2020

DOI:https://doi.org/10.1103/PhysRevB.101.161112

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Michael Klett1, Seulgi Ok2, David Riegler1, Peter Wölfle3, Ronny Thomale1,*, and Titus Neupert2,†

  • 1Institute for Theoretical Physics and Astrophysics, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
  • 2Department of Physics, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
  • 3Institute for Theory of Condensed Matter, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany

  • *rthomale@physik.uni-wuerzburg.de
  • titus.neupert@uzh.ch

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Issue

Vol. 101, Iss. 16 — 15 April 2020

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