Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Density of States below the Thouless Gap in a Mesoscopic SNS Junction   Quasiclassical theory predicts an existence of a sharp energy gap E_g \sim
D/L^2 in the excitation spectrum of a long diffusive superconductor--normal
metal--superconductor (SNS) junction. We show that mesoscopic fluctuations
remove the sharp edge of the spectrum, leading to a nonzero DoS for all
energies. Physically, this effect originates from the quasi-localized states in
the normal metal. Technically, we use an extension of Efetov's supermatrix
sigma-model for mixed NS systems. We demonstrate the equivalence of the
supersymmetric saddle-point solution to the standard quasiclassical Usadel
solution, and show that the instanton solution with broken supersymmetry
provides a non-zero DoS at energies E < E_g.

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The categories of this paper are: hep-ex
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The categories of this paper are: adap-org
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
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The categories of this paper are: econ
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph