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Operator and entanglement growth in nonthermalizing systems: Many-body localization and the random singlet phase
We characterize the growth and spreading of operators and entanglement in two paradigmatic nonthermalizing phases---the many-body localized (MBL) phase and the random singlet phase (RSP)---using the entanglement contour and multipartite operator entanglement measures. The entanglement contour characterizes the spacetime spreading of entanglement and reveals logarithmically growing entanglement light cones in …