Regensburg 2019 – wissenschaftliches Programm
TT 17.21: Poster
Montag, 1. April 2019, 15:00–18:30, Poster D
Magnon Landau levels and emergent supersymmetry in strained antiferromagnets — •Mary Madelynn Nayga1, Stephan Rachel2, and Matthias Vojta1 — 1Institut für Theoretische Physik, Technische Universität Dresden, 01062 Dresden, Germany — 2School of Physics, University of Melbourne, Parkville, VIC 3010, Australia
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.