Magnon Landau Levels and Emergent Supersymmetry in Strained Antiferromagnets

Mary Madelynn Nayga, Stephan Rachel, and Matthias Vojta
Phys. Rev. Lett. 123, 207204 – Published 15 November 2019
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Abstract

Inhomogeneous strain applied to lattice systems can induce artificial gauge fields for particles moving on this lattice. Here we demonstrate how to engineer a novel state of matter, namely an antiferromagnet with a Landau-level excitation spectrum of magnons. We consider a honeycomb-lattice Heisenberg model and show that triaxial strain leads to equally spaced pseudo-Landau levels at the upper end of the magnon spectrum, with degeneracies characteristic of emergent supersymmetry. We also present a particular strain protocol which induces perfectly quantized magnon Landau levels over the whole bandwidth. We discuss experimental realizations and generalizations.

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  • Received 19 March 2019

DOI:https://doi.org/10.1103/PhysRevLett.123.207204

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Mary Madelynn Nayga1,2, Stephan Rachel3, and Matthias Vojta1

  • 1Institut für Theoretische Physik and Würzburg-Dresden Cluster of Excellence ct.qmat, Technische Universität Dresden, 01062 Dresden, Germany
  • 2Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, 01187 Dresden, Germany
  • 3School of Physics, University of Melbourne, Parkville, VIC 3010, Australia

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Issue

Vol. 123, Iss. 20 — 15 November 2019

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