Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Activating superconductivity in a repulsive system by high-energy
  degrees of freedom   We discuss superconducting pairing in a narrow conduction band sandwiched
between unoccupied and occupied bands, an arrangement that enables an
unconventional pairing mechanism governed by Coulomb repulsion. Pairing
interaction originates from repulsion-assisted scattering between far-out pair
states in the higher-energy bands and those at the Fermi level. Optimizing the
bandstructure design and carrier density in order to bring plasma frequency
below the bandgap renders the repulsion unscreened for the processes with a
large frequency transfer. This allows the pairing to fully benefit from the
pristine Coulomb repulsion strength. The repulsion-induced attraction is
particularly strong in two dimensions and is assisted by a low density of
carriers and the resulting low plasma frequency values. We assess the possible
connection of this mechanism to superconductivity in magic-angle twisted
bilayer graphene where the bandstructure features wide dispersive upper and
lower minibands. We use a simple model to illustrate the importance of the
far-out pairs in these bands and predict testable signatures of this
superconductivity mechanism.

29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin