[EQI] Eddleman Quantum Institute Seminar Series
Abstract: Using the fragmentation procedure on the dumbbell model of spin ice [1,2], it is shown that the deconfined magnetic monopoles are topologically constrained by classical Dirac strings defined in the space-time of particle trajectories. The consequences of the topological constraints are addressed for real Dirac monopoles and their strings and the Stanford experiment for Dirac monopole detection [3] is reconstructed in model spin ice. The experimental setup is used to study magnetic noise experiments [4] in a simulation with stochastic dynamics. It is shown that the noise from the monopoles and their constraining strings can be separated and that the correlated signal over long times comes largely from the constraining strings rather than from the monopoles themselves.
[1] Brooks-Bartlett et al, PRX 4, 011007, 2014
[2] Castelnovo, Moessner, Sondhi, Nature, 451, 42, 2008
[3] B. Cabrera, Phys. Rev. Lett. 48, 1378–1381 (1982)
[4] R. Dusad et al, Nature volume 571, pages 234–239 (2019)