Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Detecting phase transitions in- and out-of-equilibrium via
  single-particle covariance matrices   In this letter we address the problem of detecting phase transitions without
prior knowledge of a suitable order parameter. To this end, we propose a notion
of metric based on the distance between single-particle covariance matrices.
Unlike the well-known fidelity susceptibility, this quantity is accessible to
commonly employed numerical techniques and can potentially serve as a versatile
instrument to identify phase transitions beyond Landau's paradigm. In
particular, we demonstrate that one choice of metric, which we dubbed
single-particle affinity and that coincides with the fidelity for quadratic
models can identify non-equilibrium phase transitions. This is shown for a
boundary-driven fermion chain under Markovian dissipation, that escapes
Landau's framework. We also apply this method to a fermion ladder and find a
rather rich phase diagram, contrary to what would be expected from preceding
related work on spin ladders.

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The categories of this paper are: atom-ph
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The categories of this paper are: physics
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The categories of this paper are: funct-an
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The categories of this paper are: gr-qc
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The categories of this paper are: mtrl-th
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The categories of this paper are: ao-sci
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The categories of this paper are: bayes-an
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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: hep-th
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The categories of this paper are: dg-ga
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The categories of this paper are: alg-geom
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The categories of this paper are: stat
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The categories of this paper are: nucl-th
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The categories of this paper are: solv-int
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The categories of this paper are: math-ph