Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Finite Temperature Dynamical Correlations using the Microcanonical
  Ensemble and the Lanczos Algorithm   We show how to generalise the zero temperature Lanczos method for calculating
dynamical correlation functions to finite temperatures. The key is the
microcanonical ensemble, which allows us to replace the involved canonical
ensemble with a single appropriately chosen state; in the thermodynamic limit
it provides the same physics as the canonical ensemble but with the evaluation
of a single expectation value. We can employ the same system sizes as for zero
temperature, but whereas the statistical fluctuations present in small systems
are prohibitive, the spectra of the largest system sizes are surprisingly
smooth. We investigate, as a test case, the spin conductivity of the spin-1/2
anisotropic Heisenberg model and in particular we present a comparison of
spectra obtained by the canonical and microcanonical ensemble methods.

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The categories of this paper are: chem-ph
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The categories of this paper are: solv-int
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The categories of this paper are: funct-an
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The categories of this paper are: acc-phys
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The categories of this paper are: astro-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: dg-ga
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The categories of this paper are: ao-sci
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The categories of this paper are: math
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The categories of this paper are: patt-sol
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The categories of this paper are: eess
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The categories of this paper are: bayes-an
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-ex
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The categories of this paper are: math-ph
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The categories of this paper are: atom-ph