On an effective gauge field description of a positron impurity in polarizable media

J Arponen, RF Bishop, E Pajanne

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    Abstract

    The local polarization around a positron impurity is described by a unitary operator, which defines a dynamical gauge field in interaction with the particle. We study the relation of this gauge field to the elementary collective excitations of the medium. We make contact with the generalized coherent bosonization scheme recently introduced in the extended coupled cluster theory, which suggests a definite parametrization of the polarization unitary operator in terms of a double similarity transformation. We derive the exact equations for the wave function and for the CCM amplitudes and show that they satisfy the conservation laws.
    Original languageEnglish
    Title of host publicationCondensed Matter Theories, Vol. 2
    EditorsP. Vashishta, Rajiv K. Kalia, R.F. Bishop
    PublisherPlenum Publishing Corporation
    Pages373-387
    Number of pages15
    ISBN (Print)9780306426711
    Publication statusPublished - 1987

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