Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: One-dimensional electron gas interacting with a Heisenberg spin-1/2
  chain   We analyse a model of a one-dimensional electron gas interacting with an
antiferromagnetic Heisenberg spin-1/2 chain via the spin exchange interactions.
Using a solution at a special limit, we characterize the gapless modes of the
spin gap fixed point at weak coupling $ J_{K}\ll J_{H},E_{F} $. we show that
the only gapless pairing mode with divergent susceptibility is a composite
odd-parity odd-frequency singlet pairing order parameter, while the ordinary
BCS even-parity singlet pairing mode is incoherent. For 2-leg ladder systems,
we note that it is possible to have a range of doping where the chemical
potential cuts only the anti-bonding band while the bonding band remains
half-filled. We propose that, in such a state, the 2-leg ladder is effectively
realizing the one-dimensional Kondo-Heisenberg model.

28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat
18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc
11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs