Periodic Sturm-Liouville problems related to two Riccati equations of constant coefficients

Details Periodic Sturm-Liouville problems related to two Riccati equations of constant coefficients Periodic Sturm-Liouville problems related to two Riccati equations of constant coefficients

2009-10-08

arxiv.org/abs/0910.1377v3

Physics

Mathematical Physics

15 pages, 4 eps figures, a few minor changes, version accepted to Ann. Phys

Scientific paper

We consider two closely related Riccati equations of constant parameters whose particular solutions are used to construct the corresponding class of supersymmetrically-coupled second-order differential equations. We solve analytically these parametric periodic problems along the positive real axis. Next, the analytically solved model is used as a case study for a powerful numerical approach that is employed here for the first time in the investigation of the energy band structure of periodic not necessarily regular potentials. The approach is based on the well-known self-matching procedure of James (1949) and implements the spectral parameter power series solutions introduced by Kravchenko (2008). We obtain additionally an efficient series representation of the Hill discriminant based on Kravchenko's series

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