Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Many-body delocalization dynamics in long Aubry-Andr\'e quasiperiodic
  chains   We study quench dynamics in an interacting spin chain with a quasi-periodic
on-site field, known as the interacting Aubry-Andr\'e model of many-body
localization. Using the time-dependent variational principle, we assess the
late-time behavior for chains up to $L = 50$. We find that the choice of
periodicity $\Phi$ of the quasi-periodic field influences the dynamics. For
$\Phi = (\sqrt{5}-1)/2$ (the inverse golden ratio) and interaction $\Delta =
1$, the model most frequently considered in the literature, we obtain the
critical disorder $W_c = 4.8 \pm 0.5$ in units where the non-interacting
transition is at $W = 2$. At the same time, for periodicity $\Phi = \sqrt{2}/2$
we obtain a considerably higher critical value, $W_c = 7.8 \pm 0.5$.
Finite-size effects on the critical disorder $W_c$ are much weaker than in the
purely random case. This supports the enhancement of $W_c$ in the case of a
purely random potential by rare "ergodic spots," which do not occur in the
quasi-periodic case. Further, the data suggest that the decay of the
antiferromagnetic order in the delocalized phase is faster than a power law.

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The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: astro-ph
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
11
The categories of this paper are: hep-lat
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The categories of this paper are: nucl-th
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The categories of this paper are: nlin
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The categories of this paper are: chao-dyn
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The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc