Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two-electron quantum dot molecule: Composite particles and the spin
  phase diagram   We study a two-electron quantum dot molecule in a magnetic field by the
direct diagonalization of the Hamiltonian matrix. The ground states of the
molecule with the total spin S=0 and S=1 provide a possible realization for a
qubit of a quantum computer. Switching between the states is best achieved by
changing the magnetic field. Based on an analysis of the wave function, we show
that the system consists of composite particles formed by an electron and flux
quanta attached to it. This picture can also be used to explain the spin phase
diagram.

28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
20
The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol