Geodesic
On the Spectrum of a Discrete Non-Hermitian Quantum System
Symmetry, integrability and geometry: methods and applications, Tome 5 (2009) Cet article a éte moissonné depuis la source Math-Net.Ru

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In this paper, we develop spectral analysis of a discrete non-Hermitian quantum system that is a discrete counterpart of some continuous quantum systems on a complex contour. In particular, simple conditions for discreteness of the spectrum are established.
Keywords: difference operator; non-Hermiticity; spectrum; eigenvalue; eigenvector; completely continuous operator. 
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