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Boundary Conditions for Sturm-Liouville Equation with Transition Regions and Barriers or Wells

Advances in Pure Mathematics 2021年第4期11卷 254-295页

作者： Alfred Wünsche Institut für Physik Humboldt-Universit&#228 t Nonclassical Radiation Berlin Germany

By means of expansions of rapidly in infinity decreasing functions in delta functions and their derivatives, we derive generalized boundary conditions of the Sturm-Liouville equation for transitions and barriers or wells between two asymptotic potentials for which the solutions are supposed as known. We call such expansions “moment series” because the coefficients are determined by moments of the function. An infinite system of boundary conditions is obtained and it is shown how by truncation it can be reduced to approximations of a different order (explicitly made up to third order). Reflection and refraction problems are considered with such approximations and also discrete bound states possible in nonsymmetric and symmetric potential wells are dealt with. This is applicable for large wavelengths compared with characteristic lengths of potential changes. In Appendices we represent the corresponding foundations of Generalized functions and apply them to barriers and wells and to transition functions. The Sturm-Liouville equation is not only interesting because some important second-order differential equations can be reduced to it but also because it is easier to demonstrates some details of the derivations for this one-dimensional equation than for the full three-dimensional vectorial equations of electrodynamics of media. The article continues a paper that was made long ago.

关键词： Schrödinger Equation Drude Approximation Transition Layer Potential Barrier Potential Well Reflection Refraction moment series Generalized Functions Delta Function and Its Derivatives Discrete or Bound Eigenstates

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