Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-equilibrium transport theory of the singlet-triplet transition:
  perturbative approach   We use a simple iterative perturbation theory to study the singlet-triplet
(ST) transition in lateral and vertical quantum dots, modeled by the
non-equilibrium two-level Anderson model. To a great surprise, the region of
stable perturbation theory extends to relatively strong interactions, and this
simple approach is able to reproduce all experimentally-observed features of
the ST transition, including the formation of a dip in the differential
conductance of a lateral dot indicative of the two-stage Kondo effect, or the
maximum in the linear conductance around the transition point. Choosing the
right starting point to the perturbation theory is, however, crucial to obtain
reliable and meaningful results.

36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
12
The categories of this paper are: nucl-th