Sleuthing hidden orders and hidden spin liquids in quantum magnets
Arun Paramekanti
University of Toronto
Wednesday, February 7, 2024
10:30 a.m.
In-person: QNC 1101
Abstract: The combination of spin-orbit interaction and crystal field physics can stabilize novel multipolar magnetism beyond conventional dipolar order. Such "hidden orders" are hard to probe. I will discuss aspects of this physics in certain spin-1/2 magnets where various puzzling experiments can be reconciled in terms of octupolar magnetism with orbital loop currents and how doped impurities can lead to a distinct type of transverse field Ising magnetism - some of our computed results are in agreement with recent impurity NMR experiments. I will also discuss possible "hidden spin liquid" physics lurking behind certain results on honeycomb cobaltate compounds where our numerical results suggest a "Dirac"-type spin liquid might be a proximate state of the XXZ spin model which appears to explain a number of experiments including THz spectroscopy and thermal transport.