Weak Ergodicity Breaking and Quantum Many-Body Scars in Spin-1 XY Magnets.

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ID: 97133
2019
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Abstract
We study the spin-1 XY model on a hypercubic lattice in d dimensions and show that this well-known nonintegrable model hosts an extensive set of anomalous finite-energy-density eigenstates with remarkable properties. Namely, they exhibit subextensive entanglement entropy and spatiotemporal long-range order, both believed to be impossible in typical highly excited eigenstates of nonintegrable quantum many-body systems. While generic initial states are expected to thermalize, we show analytically that the eigenstates we construct lead to weak ergodicity breaking in the form of persistent oscillations of local observables following certain quantum quenches-in other words, these eigenstates provide an archetypal example of so-called quantum many-body scars. This Letter opens the door to the analytical study of the microscopic origin, dynamical signatures, and stability of such phenomena.
Reference Key
schecter2019weakphysical Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Schecter, Michael;Iadecola, Thomas;
Journal physical review letters
Year 2019
DOI
10.1103/PhysRevLett.123.147201
URL
Keywords Keywords not found

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