PIRSA:14050083

Video URL

https://pirsa.org/14050083

Can Eigenstate Thermalization Breakdown without Disorder?

Fisher, M. (2014). Can Eigenstate Thermalization Breakdown without Disorder?. Perimeter Institute for Theoretical Physics. https://pirsa.org/14050083

Fisher, Matthew. Can Eigenstate Thermalization Breakdown without Disorder?. Perimeter Institute for Theoretical Physics, May. 15, 2014, https://pirsa.org/14050083 

          @misc{ scivideos_PIRSA:14050083,
            doi = {10.48660/14050083},
            url = {https://pirsa.org/14050083},
            author = {Fisher, Matthew},
            keywords = {},
            language = {en},
            title = {Can Eigenstate Thermalization Breakdown without Disorder?},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2014},
            month = {may},
            note = {PIRSA:14050083 see, \url{https://scivideos.org/pirsa/14050083}}
          }

Matthew Fisher University of California, Santa Barbara

Talk numberPIRSA:14050083
DOI10.48660/14050083
Source RepositoryPIRSA
Collection
Talk Type Conference

Abstract

We describe a new diagnostic for many-body wavefunctions which generalizes the spatial bipartite entanglement entropy. By was of illustration, for a two-component wavefunction of heavy and light particles, a partial (projective) measurement of the coordinates of the heavy (but not light) particles is first performed, and then the entanglement entropy of the projected wavefunction for the light particles is computed. If the two-component wavefunction has a volume law entanglement entropy, yet the post measurement wavefunction of the light particles is disentangled with an area law entanglement, we refer to the original wavefunction as a “Quantum Disentangled State”. This diagnostic can be generalized to include other partial measurements, such as measuring the charge, but not spin, for finite-energy density eigenstates of Fermion Hubbard-type model. Quantum disentanglement results if the post measurement spin-wavefunction has an area law entanglement entropy. Recent numerics searching for such Quantum Disentangled States in 1d Hubbard-type models will be discussed in detail.