Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Thermalization of a Dimerized Antiferromagnetic Spin Chain   Thermalization is investigated for the one-dimensional anisotropic
antiferromagnetic Heisenberg model with dimerized nearest-neighbor interactions
that break integrability. For this purpose the time evolution of local operator
expectation values after an interacting quench is calculated directly with the
Chebyshev polynomial expansion, and the deviation of the diagonal from the
canonical thermal ensemble value is calculated for increasing system size for
these operators. The spatial and spin symmetries of the Hamiltonian are taken
into account to divide it into symmetry subsectors. The rate of thermalization
is found to weaken with the dimerization parameter as the Hamiltonian evolves
between two integrable limits, the non-dimerized and the fully dimerized where
the chain breaks up into isolated dimers. This conclusion is supported by the
distribution of the local operator off-diagonal elements between the
eigenstates of the Hamiltonian with respect to their energy difference, which
determines the strength of temporal fluctuations. The off-diagonal elements
have a low-energy peak for small dimerization which facilitates thermalization,
and originates in the reduction of spatial symmetry with respect to the
non-dimerized limit. For increasing dimerization their distribution changes and
develops a single low-energy maximum that relates to the fully dimerized limit
and slows down thermalization.

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The categories of this paper are: q-bio
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The categories of this paper are: cmp-lg
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The categories of this paper are: nlin
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The categories of this paper are: hep-th
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The categories of this paper are: chem-ph
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The categories of this paper are: eess
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The categories of this paper are: nucl-ex
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The categories of this paper are: astro-ph
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The categories of this paper are: adap-org
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The categories of this paper are: patt-sol
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The categories of this paper are: physics
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The categories of this paper are: solv-int
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The categories of this paper are: gr-qc
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The categories of this paper are: math-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: comp-gas