Siegl, Julian and Schliemann, John (2023) Imperfect many-body localization in exchange-disordered isotropic spin chains. NEW JOURNAL OF PHYSICS, 25 (12): 123002. ISSN 1367-2630
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We investigate many-body localization in isotropic Heisenberg spin chains with the local exchange parameters being subject to quenched disorder. Such systems incorporate a nonabelian symmetry in their Hamiltonian by invariance under global SU(2)-rotations. Nonabelian symmetries are predicted to hinder the emergence of a many-body localized phase even in the presence of strong disorder. We report on numerical studies using exact diagonalization for chains of common spin length 1/2 and 1. The averaged consecutive-gap ratios display a transition compatible with a crossover from an ergodic phase at small disorder strength to an incompletely localized phase at stronger disorder. Studying the sample-to-sample variance of the averaged consecutive-gap ratio, we distinguish this incompletely localized phase from the fully many-body localized phase by its scaling behavior.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | STATISTICAL-MECHANICS; QUANTUM; THERMALIZATION; PHYSICS; SYSTEM; CHAOS; localization; many-body localization; Heisenberg chain |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Grifoni > Group John Schliemann |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 22 Feb 2024 05:55 |
| Last Modified: | 22 Feb 2024 05:55 |
| URI: | https://pred.uni-regensburg.de/id/eprint/58962 |
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