Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Extracting the ground-state spin of a quantum dot from the conductance
  peaks in a parallel magnetic field at finite temperature   We derive a closed expression for the finite-temperature conductance of a
Coulomb-blockade quantum dot in the presence of an exchange interaction and a
parallel magnetic field. Parallel-field dependence of Coulomb-blockade peak
position has been used to determine experimentally the ground-state spin of
quantum dots. We find that for a realistic value of the exchange interaction,
the peak motion can be significantly affected at temperatures as low as kT ~
0.1 Delta, with Delta being the mean level spacing in the dot. This temperature
effect can lead to misidentification of the ground-state spin when a level
crossing occurs at low fields. We propose an improved method to determine
unambiguously the ground-state spin. This method takes into account level
crossings and temperature effects at a finite exchange interaction.

17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
23
The categories of this paper are: solv-int
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
1
The categories of this paper are: cs
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con