Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnon delocalization in ferromagnetic chains with long-range correlated
  disorder   We study one-magnon excitations in a random ferromagnetic Heisenberg chain
with long-range correlations in the coupling constant distribution. By
employing an exact diagonalization procedure, we compute the localization
length of all one-magnon states within the band of allowed energies $E$. The
random distribution of coupling constants was assumed to have a power spectrum
decaying as $S(k)\propto 1/k^{\alpha}$. We found that for $\alpha < 1$,
one-magnon excitations remain exponentially localized with the localization
length $\xi$ diverging as 1/E. For $\alpha = 1$ a faster divergence of $\xi$ is
obtained. For any $\alpha > 1$, a phase of delocalized magnons emerges at the
bottom of the band. We characterize the scaling behavior of the localization
length on all regimes and relate it with the scaling properties of the
long-range correlated exchange coupling distribution.

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The categories of this paper are: q-alg
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
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The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
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The categories of this paper are: acc-phys
14
The categories of this paper are: math-ph
3
The categories of this paper are: physics
0
The categories of this paper are: hep-ph
1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th