2019/03/31 by Mary Madelynn Nayga, Stephan Rachel, Matthias Vojta · 1 citation
Physics and Astronomy · #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.123.207204
published as Phys. Rev. Lett. 123, 207204 (2019) · 5+7 pages, 3+5 figs; (v2)extended discussion and minor changes
arxiv created 2019/09/05 · arxiv updated 2019/11/18
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.