Disorder & Ergodicity Breaking
How disorder and driving control ergodicity in quantum many-body systems — a single progression from equilibrium disorder, to disorder plus periodic driving, to using that driving to deliberately engineer specific ergodicity-breaking dynamics.
Children: Many-Body Localization & Griffiths Effects (nests Driven/Floquet Localization & Symmetry Engineering, which in turn nests Many-Body Scars from Floquet Automata).