Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Kinky Behavior in Josephson Junctions   We analyze nonperturbatively the behavior of a Josephson junction in which
two BCS superconductors are coupled through an Anderson impurity. We recover
earlier perturbative results which found that a $\delta=\pi$ phase difference
is preferred when the impurity is singly occupied and the on-site Coulomb
interaction is large. We find a novel intermediate phase in which one of
$\delta=0$ and $\delta=\pi$ is stable while the other is metastable, with the
energy $E(\delta)$ having a kink somewhere in between. As a consequence of the
kink, the $I-V$ characteristics of the junction are modified at low voltages.

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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: chem-ph
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The categories of this paper are: supr-con
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The categories of this paper are: nucl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: eess
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The categories of this paper are: q-fin
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The categories of this paper are: econ
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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: physics
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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: quant-ph
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The categories of this paper are: acc-phys