Discrete spectrum of a pair of nonsymmetric waveguides coupled by a window

Details Discrete spectrum of a pair of nonsymmetric waveguides coupled by a window Discrete spectrum of a pair of nonsymmetric waveguides coupled by a window

2005-12-20

arxiv.org/abs/math-ph/0512066v3

Sbornik Mathematics. 2006. V. 197. No. 4. P. 475-504.

Physics

Mathematical Physics

The original text was written in Russian. This is a translation made by the author. In the revised version just some minor cha

Scientific paper

In the paper we study the discrete spectrum of a pair of quantum two-dimensional waveguides having common boundary in which a window of finite length is cut out. We study the phenomenon of new eigenvalues emerging from the threshold of the essential spectrum when the length of window passes through critical values. We construct the asymptotics expansions for the emerging eigenvalues with respect to small parameter which is the difference between current length of the window and the nearest critical value. We also study the behaviour of the spectrum when the length of the window increases unboundedly and construct asymptotics expansions with respect to great parameter which is a length of the window.

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