Fragmentation in Spin Ice Systems

This lecture explores the concept of fragmentation in spin ice systems, focusing on the magnetic ice rules, spin ice models, monopole vacuum, emergent gauge fields, topological defects, and monopole crystal phases. The instructor discusses the emergence of hard core dimers, the Dirac string protocol, and the KII phase of kagomé ice, highlighting the experimental results and neutron scattering signatures. The lecture concludes with a discussion on quantum Monte Carlo simulations of quantum spin ice, emphasizing the ordering out of the dimer liquid phase and the neutron scattering signatures for different phases.