Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Effect of the surface curvature on the magnetic moment and persistent
  currents in two-dimensional quantum rings and dots   The effect of the surface curvature on the magnetic moment and persistent
currents in two-dimensional (2D) quantum rings and dots is investigated. It is
shown that the surface curvature decreases the spacing between neighboring
maxima of de Haas -- van Alphen (dHvA) type oscillations of the magnetic moment
of a ring and decreases the amplitude and period of Aharonov -- Bohm (AB) type
oscillations. In the case of a quantum dot, the surface curvature reduces the
level degeneracy at zero magnetic fields. This leads to a suppression of the
magnetic moment at low magnetic fields. The relation between the persistent
current and the magnetic moment is studied. We show that the surface curvature
decreases the amplitude and the period of persistent current oscillations.

23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
2
The categories of this paper are: math
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg