Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Drude Weight at Finite Temperatures for Some Non-Integrable Quantum
  Systems in One Dimension   Using conformal perturbation theory, we show that for some classes of the
one-dimensional quantum liquids that possess the Luttinger liquid fixed point
in the low energy limit, the Drude weight at finite temperatures is
non-vanishing, even when the system is {\it non-integrable} and the total
current is not conserved. We also obtain the asymptotically exact
low-temperature formula of the Drude weight for Heisenberg XXZ spin chains,
which agrees quite well with recent numerical data.

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The categories of this paper are: stat
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The categories of this paper are: econ
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The categories of this paper are: supr-con
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The categories of this paper are: mtrl-th
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-lat
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The categories of this paper are: math
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The categories of this paper are: nucl-ex
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The categories of this paper are: comp-gas
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The categories of this paper are: nlin
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The categories of this paper are: q-alg
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The categories of this paper are: alg-geom
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The categories of this paper are: dg-ga
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The categories of this paper are: atom-ph