CM THEORY SEMINAR<br>NOTE: Time and Location Change<br>Can Thermalization Breakdown in Quantum Many-Body Systems?

We describe a new diagnostic for thermal (volume law entangled) many-body wavefunctions, involving making a partial (projective) measurement on a subset of the degrees of freedom and analyzing the spatial entanglement properties of the unmeasured degrees of freedom. In a Quantum Disentangled state, the post-measurement entanglement entropy is an area law, revealing a hidden locality. Eigenstates of such form would indicate a subtle breakdown of thermalization due to quantum effects. Numerics searching for such Quantum Disentangled eigenstates in 1d Hubbard-type models will be discussed in detail.