  We consider tubular nanowires with a polygonal cross-section. In this
geometry the lowest energy states are separated in two sets, one of corner and
one of side-localized states, respectively. The presence of an external
magnetic field transverse to the nanowire imposes an additional localization
mechanism, the electrons being pushed sideways relatively to the direction of
the field. This effect has important implications on the current density, as it
creates current loops induced by the Lorentz force. We calculate numerically
the electromagnetic field radiated by hexagonal, square, and triangular
nanowires. We demonstrate that, because of the aforementioned localization
properties, the radiated field can have a complex distribution determined by
the internal geometry of the nanowire. We suggest that measuring the field in
the neighborhood of the nanowire could be the basic idea of a tomography of the
electron distribution inside it, if a smaller receiver antenna could be placed
in that zone.

Mesoscale and Nanoscale Physics