WKB approximation reveals spatial localization in Green's function for non-interacting particles, suggesting effects from an external electrical field.
The quasiclassical (WKB) expression for Green's function of two non-interacting particles in the external electrical field has been obtained and its radial dependence has been investigated. The essential spatial localization of the real part of this function has been shown.
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Verbytsky et al. (2003) studied this question.
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