Characterizing complexity of many-body quantum dynamics by higher-order eigenstate thermalization
Characterizing complexity of many-body quantum dynamics by higher-order eigenstate thermalization
Complexity of dynamics is at the core of quantum many-body chaos and exhibits a hierarchical feature: higher-order complexity implies more chaotic dynamics. Conventional ergodicity in thermalization processes is a manifestation of the lowest-order complexity, which is represented by the eigenstate thermalization hypothesis (ETH) stating that individual energy eigenstates are thermal. …