Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Enhancement of Kondo effect in quantum dots with an even number of
  electrons   We investigate the Kondo effect in a quantum dot with almost degenerate
spin-singlet and triplet states for an even number of electrons. We show that
the Kondo temperature as a function of the energy difference between the states
Delta reaches its maximum around Delta=0 and decreases with increasing Delta.
The Kondo effect is thus enhanced by competition between singlet and triplet
states. Our results explain recent experimental findings. We evaluate the
linear conductance in the perturbative regime.

28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin