Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Anisotropic plasmon-coupling dimerization of a pair of spherical
  electron gases   We have discovered a novel feature in the plasmon excitations for a pair of
Coulomb-coupled non- concentric spherical two-dimensional electron gases
(S2DEGs). Our results show that the plasmon excitations for such pairs depend
on the orientation with respect to the external electromagnetic probe field.
The origin of this anisotropy of the inter-sphere Coulomb interaction is due to
the directional asymmetry of the electrostatic coupling of electrons in excited
states which depend on both the angular momentum quantum number L and its
projection M on the axis of quantization taken as the probe E-field direction.
We demonstrate the anisotropic inter-sphere Coulomb coupling in space and
present semi-analytic results in the random-phase approximation both
perpendicular and parallel to the axis of quantization. For the incidence of
light with a finite orbital or spin angular momentum, the magnetic field
generated from an induced oscillating electric dipole on one sphere can couple
to an induced magnetic dipole on another sphere in a way depending on the
direction parallel or perpendicular to the probe E field. Such an effect from
the plasmon spatial correlation is expected to be experimentally observable by
employing circularly-polarized light or a helical light beam for incidence. The
S2DEG serves as a simple model for fullerenes as well as metallic dimers, when
the energy bands are far apart.

7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
29
The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con