Naboko, Serguei,
Simonov, Sergey
(2012)
*
Zeroes of the spectral density of the periodic Schrödinger operator with Wigner–von Neumann potential.
*
Mathematical Proceedings of the Cambridge Philosophical Society,
153
(01).
pp. 33-58.
ISSN 1469-8064.
(doi:10.1017/S030500411100079X)
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Official URL http://dx.doi.org/10.1017/S030500411100079X |

## Abstract

We consider the Schrödinger operator ? on the half-line with a periodic background potential and the Wigner–von Neumann potential of Coulomb type: csin(2?x + ?)/(x + 1). It is known that the continuous spectrum of the operator ? has the same band-gap structure as the free periodic operator, whereas in each band of the absolutely continuous spectrum there exist two points (so-called critical or resonance) where the operator ? has a subordinate solution, which can be either an eigenvalue or a “half-bound” state. The phenomenon of an embedded eigenvalue is unstable under the change of the boundary condition as well as under the local change of the potential, in other words, it is not generic. We prove that in the general case the spectral density of the operator ? has power-like zeroes at critical points (i.e., the absolutely continuous spectrum has pseudogaps). This phenomenon is stable in the above-mentioned sense.

Item Type: | Article |
---|---|

DOI/Identification number: | 10.1017/S030500411100079X |

Additional information: | number of additional authors: 1; |

Subjects: |
Q Science > QA Mathematics (inc Computing science) Q Science > QA Mathematics (inc Computing science) > QA276 Mathematical statistics |

Divisions: | Faculties > Sciences > School of Mathematics Statistics and Actuarial Science |

Depositing User: | Stewart Brownrigg |

Date Deposited: | 07 Mar 2014 00:05 UTC |

Last Modified: | 29 May 2019 12:25 UTC |

Resource URI: | https://kar.kent.ac.uk/id/eprint/40459 (The current URI for this page, for reference purposes) |

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