On the existence of resonances in the transmission probability for interactions arising from derivatives of Dirac s delta function
- 24 June 2003
- journal article
- research article
- Published by IOP Publishing in Journal of Physics A: General Physics
- Vol. 36 (27), 7589-7600
- https://doi.org/10.1088/0305-4470/36/27/311
Abstract
The scattering properties of regularizing finite-range potentials constructed in the form of squeezed rectangles, which approximate the first and second derivatives of the Dirac delta function δ(x), are studied in the zero-range limit. Particularly, for a countable set of interaction strength values, a non-zero transmission through the point potential δ'(x), defined as the weak limit (in the standard sense of distributions) of a special dipole-like sequence of rectangles, is shown to exist when the rectangles are squeezed to zero width. A tripole sequence of rectangles, which gives in the weak limit the distribution δ''(x), is demonstrated to exhibit the total transmission for a countable sequence of the rectangle's width that tends to zero. However, this tripole sequence does not admit a well-defined point interaction in the zero-range limit, making sense only for a finite range of the regularizing rectangular-like potentials.This publication has 27 references indexed in Scilit:
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