German-Ukrainian Seminar on Quantum Materials

Lecture #9: May 4, 2023 at 14:00 Kyiv time (13:00 Dresden time)

Meeting ID: 992 8170 3595 // Passcode: 963908

Speaker: Roderich Moessner, Max Planck Institute for the Physics of Complex Systems, Dresden

Title: Absence of diffusion in certain non-random magnets

Thanks to their ubiquity and relative simplicity, magnets have played a central role in our understanding of the collective behaviour of matter. This talk presents very simple magnetic models which host highly unusual dynamical phenomena thanks to an emergent gauge field: one has fractionalised quasiparticles that move on a purely dynamical fractal invisible to thermodynamics; and the other exhibits localisation in the absence of disorder. While the former is based on an existing magnetic material called spin ice, various phenomena in these models -- known and unknown -- are in search of an experimental realisation.
Science 378, 1218 (2022)
Phys. Rev. Lett. 118, 266601 (2017)