Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Transport through a quantum ring, a dot and a barrier embedded in a
  nanowire in magnetic field   We investigate the transport through a quantum ring, a dot and a barrier
embedded in a nanowire in a homogeneous perpendicular magnetic field. To be
able to treat scattering potentials of finite extent in magnetic field we use a
mixed momentum-coordinate representation to obtain an integral equation for the
multiband scattering matrix. For a large embedded quantum ring we are able to
obtain Aharanov-Bohm type of oscillations with superimposed narrow resonances
caused by interaction with quasi-bound states in the ring. We also employ
scattering matrix approach to calculate the conductance through a semi-extended
barrier or well in the wire. The numerical implementations we resort to in
order to describe the cases of weak and intermediate magnetic field allow us to
produce high resolution maps of the ``near field'' scattering wave functions,
which are used to shed light on the underlying scattering processes.

23
The categories of this paper are: solv-int
13
The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom