Higher-order effects in hopping-type tra
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Article
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1981
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Elsevier Science
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English
⚖ 138 KB
The effect of the addition of a complex potential X Vsep to an arbitrary Schriidinger operator H == H,, + V on the singularities of the S matrix, as a function of /\, is studied. Here Vsep is a separable interaction, and h is a complex coupling parameter. The paths of these singularities are determi