Scattering of ultracold atoms by an absorbing nanowire
Physik Department, Technische Universität München,
2 Institut für Theoretische Physik, Universität Regensburg, 93040 Regensburg, Germany
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Received in final form: 22 February 2011
Published online: 27 April 2011
We study the scattering of ultracold atoms by a conducting cylindrical wire with total absorption near the surface of the wire. A hierarchy of approximations for the exact nonretarded atom-wire potential is explored. We show the existence of a semiclassical region near to the surface of the wire, which allows us to unambiguously define incoming boundary conditions for the description of total absorption at the wire surface. The semiclassical region is only reproduced by an accurate treatment of the potential. We calculate the complex s-wave scattering length for the effective two-dimensional atom-wire scattering problem. The scattering length tends to the wire radius R in the thick-wire limit, and it tends to 0 nearly as (ln R)-1 in the thin-wire limit.
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag 2011