Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Unconventional superconducting gap in underdoped cuprates   A generic theory of the quasi-particle superconducting gap in underdoped
cuprates is derived in the strong coupling limit, and found to describe
extremely well the experimental "second gap" in \textit{absolute scale}. In
drastic contrast to the standard theories of Bogoliubov quasi-particle
excitations, the quasi-particle gap is shown to originate from anomalous
kinetic process, completely unrelated to the pairing strength. Furthermore, the
$k$-dependence of the gap deviates significantly from the pure
$d_{x^2-y^2}$-wave of the order parameter. Our study reveals a new paradigm for
the nature of superconducting gap, and is expected to reconcile numerous
apparent contradictions among existing experiments toward a more coherent
understanding of high-temperature superconductivity.

31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
7
The categories of this paper are: hep-th
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
2
The categories of this paper are: math
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph