Many-body localization in infinite chains
We investigate the phase transition between an ergodic and a many-body localized phase in infinite anisotropic spin-1/2 Heisenberg chains with binary disorder. Starting from the Néel state, we analyze the decay of antiferromagnetic order ms(t) and the growth of entanglement entropy Sent(t) during u...
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| Main Authors: | , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
17 January 2017
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| In: |
Physical review
Year: 2017, Volume: 95, Issue: 4 |
| ISSN: | 2469-9969 |
| DOI: | 10.1103/PhysRevB.95.045121 |
| Online Access: | Verlag, Volltext: http://dx.doi.org/10.1103/PhysRevB.95.045121 Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevB.95.045121 
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| Author Notes: | T. Enss, F. Andraschko, and J. Sirker |
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| 520 | |a We investigate the phase transition between an ergodic and a many-body localized phase in infinite anisotropic spin-1/2 Heisenberg chains with binary disorder. Starting from the Néel state, we analyze the decay of antiferromagnetic order ms(t) and the growth of entanglement entropy Sent(t) during unitary time evolution. Near the phase transition we find that ms(t) decays exponentially to its asymptotic value ms(∞)≠0 in the localized phase while the data are consistent with a power-law decay at long times in the ergodic phase. In the localized phase, ms(∞) shows an exponential sensitivity on disorder with a critical exponent ν∼0.9. The entanglement entropy in the ergodic phase grows subballistically, Sent(t)∼tα, α≤1, with α varying continuously as a function of disorder. Exact diagonalizations for small systems, on the other hand, do not show a clear scaling with system size and attempts to determine the phase boundary from these data seem to overestimate the extent of the ergodic phase. | ||
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