Higher-order effects in hopping-type transport of small polarons: G. B. Arnold and T. Holstein. Department of Physics, University of California, Los Angeles, California 90024

• Publisher: Elsevier Science
• Year: 1981
• Tongue: English
• Weight: 138 KB
• Volume: 131
• Category: Article
• ISSN: 0003-4916
• DOI: 10.1016/0003-4916(81)90194-9

✦ Synopsis

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 determined to a great extent by certain saddle points in the momentum (or energy) plane. Certain critical phenomena recently reported in the literature are explained. Associated with these saddles are branch-type singularities in the complex X plane, which are dynamical in origin. Some examples are discussed in detail.

Mesonic

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