Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 28: Frustrated Magnets - Spin Liquids 2 (joint session TT/MA)
MA 28.4: Talk
Tuesday, March 17, 2020, 14:45–15:00, HSZ 304
Rank-2 Coulomb Spin Liquids from Classical Spins — •Owen Benton1, Han Yan2, Ludovic Jaubert3, and Nic Shannon2 — 1Max Planck Institute for the Physics of Complex Systems — 2Okinawa Institute of Science and Technology Graduate University — 3CNRS Bordeaux
Coulomb spin liquids are well studied spin liquid states exhibiting emergent electromagnetism, having a coarse-grained description corresponding to Maxwell's laws. It has recently been appreciated that even more exotic scenarios are possible, realizing generalizations of electromagnetism with rank-2 electric and magnetic fields. These are of particular interest since the emergent charges of the rank-2 electromagnetism can be fractons, with fundamentally constrained mobility.
In this talk I will describe an approach to finding simple, bilinear models, for classical spins which realize rank-2 Coulomb phases at low temperature. Such models provide access to rank-2 Coulomb phase physics in a setting amenable to efficient numerical study and also suggest directions to look for rank-2 Coulomb phases in experiment.
Remarkably, we find that a traceless, vector-charged, rank-2 Coulomb phase can be generated by perturbing a simple Heisenberg model on the pyrochlore lattice with breathing anisotropy and weak Dzyaloshinskii-Moriya interactions. This enables us to identify Yb-based breathing pyrochlores as potential candidate systems and to make explicit predictions for how the rank-2 Coulomb phase would manifest itself in experiment.