Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Theory of $(s+id)$ pairing in mixed-valent correlated metals   Motivated by the recent discovery of superconductivity in square-planar
nickelates as well as by longstanding puzzling experiments in heavy-fermion
superconductors, we study Cooper pairing between correlated $d$-electrons
coupled to a band of weakly-correlated electrons. We perform self-consistent
large N calculations on an effective $t-J$ model for the $d$-electrons with
additional hybridization. Unlike previous studies of mixed-valent systems, we
focus on parameter regimes where both hybridized bands are relevant to
determining the pairing symmetry. For sufficiently strong hybridization, we
find a robust $s+id$ pairing which breaks time-reversal and point-group
symmetries in the mixed-valent regime. Our results illustrate how intrinsically
multi-band systems such as heavy-fermions can support a number of highly
non-trivial pairing states. They also provide a putative microscopic
realization of previous phenomenological proposals of $s+id$ pairing and
suggest a potential resolution to puzzling experiments in heavy-fermion
superconductors such as U$_{1-x}$Th$_x$Be$_{13}$ which exhibit two
superconducting phase transitions and a full gap at lower temperatures.

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The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
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The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics
6
The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys