Many-Body Delocalization via Emergent Symmetry
| Autor: | Anne E. B. Nielsen, Roderich Moessner, N. S. Srivatsa |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Srivatsa, N S, Moessner, R & Nielsen, A E B 2020, ' Many-Body Delocalization via Emergent Symmetry ', Physical Review Letters, vol. 125, no. 24, 240401 . https://doi.org/10.1103/PhysRevLett.125.240401 Physical Review Letters |
| DOI: | 10.1103/PhysRevLett.125.240401 |
| Popis: | Many-body localization (MBL) provides a mechanism to avoid thermalization in many-body quantum systems. Here, we show that an emergent symmetry can protect a state from MBL. Specifically, we propose a ${\mathbb{Z}}_{2}$ symmetric model with nonlocal interactions, which has an analytically known, SU(2) invariant, critical ground state. At large disorder strength, all states at finite energy density are in a glassy MBL phase, while the lowest energy states are not. These do, however, localize when a perturbation destroys the emergent SU(2) symmetry. The model also provides an example of MBL in the presence of nonlocal, disordered interactions that are more structured than a power law. Finally, we show how the protected state can be moved into the bulk of the spectrum. |
| Databáze: | OpenAIRE |
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