One-Dimensional Discrete Stark Hamiltonian and Resonance Scattering by Impurities

Details One-Dimensional Discrete Stark Hamiltonian and Resonance Scattering by Impurities One-Dimensional Discrete Stark Hamiltonian and Resonance Scattering by Impurities

1997-03-27

arxiv.org/abs/quant-ph/9707050v1

Physics

Quantum Physics

20 pages, Latex, no figures

Scientific paper

10.1088/0305-4470/30/9/019

A one-dimensional discrete Stark Hamiltonian with a continuous electric field is constructed by extension theory methods. In absence of the impurities the model is proved to be exactly solvable, the spectrum is shown to be simple, continuous, filling the real axis; the eigenfunctions, the resolvent and the spectral measure are constructed explicitly. For this (unperturbed) system the resonance spectrum is shown to be empty. The model considering impurity in a single node is also constructed using the operator extension theory methods. The spectral analysis is performed and the dispersion equation for the resolvent singularities is obtained. The resonance spectrum is shown to contain infinite discrete set of resonances. One-to-one correspondence of the constructed Hamiltonian to some Lee-Friedrichs model is established.

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