Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Pauli spin blockade in weakly coupled quantum dots   In a two-level system, constituted by two serially coupled single level
quantum dots, coupled to external leads we find that the current is suppressed
in one direction of biasing caused by a fully occupied two-electron triplet
state in the interacting region. The efficiency of the current suppression is
governed by the ratio between the interdot tunnelling rate and the level
off-set. In the opposite bias direction, the occupation of the two-electron
triplet is lifted which allows a larger current to flow through the system,
where the conductance is provided by transitions between one-electron states
and two-electron singlet states. Is is also shown that a finite ferromagnetic
interdot exchange interaction provides an extended range of the current
suppression, while an anti-ferromagnetic exchange leads to a decreased range of
the blockade regime.

32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an