Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Controllable density of states in molecular devices: the magnetic effect
  on cyclic molecules   Through the analysis of density of states (DOS), we study two different kinds
of cyclic molecules, a sodium atomic circle and a Polycyclic Aromatic
Hydrocarbons (PAH) molecule respectively under an external magnetic field. The
results of calculation show that original DOS peaks split into two and the
positions of peaks can be modulated periodically by controlling the magnetic
field. We attribute this phenomenon to the interaction between the molecular
orbital magnetic momentum and the magnetic field. Generally, this effect is
obscure for a usual structure but obvious for the cyclic molecules.

29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
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
12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess