ausblenden:
Schlagwörter:
Antiferromagnetic materials, Excited states, Honeycomb structures, Antiferromagnets, Excitation spectrum, Experimental realizations, Heisenberg models, Honeycomb lattices, Lattice system, Magnon spectrum, Strained antiferromagnets, Supersymmetry
Zusammenfassung:
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. © 2019 American Physical Society.
