Fragmentation From Maximally Entangled State Projection

Fragmentation refers to the breakdown of ergodicity even in the absence of disorder or integrability, where local constraints restrict dynamics to exponentially many disjoint subspaces known as Krylov subspaces. In this talk, I will discuss a new type of constraints coming from the maximal entanglement entropy which naturally gives us a new perspective to understand the Hilbert space fragmentation.