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• W3105188839 abstract "This paper is divided in two parts. In the first part, the inverse spectral problem for tight-binding hamiltonians is studied. This problem is shown to have an infinite number of solutions for properly chosen energies. The space of such solutions is characterized by a hypersurface in the space of hopping amplitudes (i.e. couplings), whose dimension is half the number of sites in the array. Low dimensional examples for short chains are carefully studied and a table of exactly solvable inverse problems is provided in terms of Lie algebraic structures. With the aim of providing a method to generate lattice configurations, a set of equations for coupling constants in terms of energies is obtained; this is done by means of a new formula for the calculation of characteristic polynomials. Two examples with randomly generated spectra are studied numerically, leading to peaked distributions of couplings. In the second part of the paper, our results are applied to the design of bent waveguides, reproducing specific spectra below propagation threshold. As a demonstration, the Dirac and the finite oscillator are realized in this way. A few partially isospectral configurations are also presented." @default.
• W3105188839 created "2020-11-23" @default.
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• W3105188839 date "2016-03-18" @default.
• W3105188839 modified "2023-10-16" @default.
• W3105188839 title "Inverse lattice design and its application to bent waveguides" @default.
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• W3105188839 doi "https://doi.org/10.1088/1751-8113/49/17/175302" @default.
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