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Spectral Asymptotics for Schrödinger Operators with Periodic Point Interactions

✍ Scribed by P. Kurasov; J. Larson

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
150 KB
Volume
266
Category
Article
ISSN
0022-247X

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✦ Synopsis

Spectrum of the second-order differential operator with periodic point interactions in L 2 R is investigated. Classes of unitary equivalent operators of this type are described. Spectral asymptotics for the whole family of periodic operators are calculated. It is proven that the first several terms in the asymptotics determine the class of equivalent operators uniquely. It is proven that the spectrum of the operators with anomalous spectral asymptotics (when the ratio between the lengths of the bands and gaps tends to zero at infinity) can be approximated by standard periodic "weighted" operators with step-wise density functions. It is shown that this sequence of periodic weighted operators converges in the norm resolvent sense to the formal (generalized) resolvent of the periodic "Schrödinger operator" with certain energy-dependent boundary conditions. The operator acting in an extended Hilbert space such that its resolvent restricted to L 2 R coincides with the formal resolvent is constructed explicitly.

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