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Correlation properties of a positron in an electron liquid. Theory and applications

Корреляционные свойства позитрона в электронной Зидкости. Теория и приложения

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Il Nuovo Cimento B (1971-1996)

Summary

A many-body theory of the correlation properties of a positron in an electron liquid is presented. It is based on the linear response formalism. Explicit nonperturbative approximate expressions and numerical results for the positron self-energy and chemical potential are given. The quasi-particle behaviour of the positron is studied in detail. Some implications of correlations in the case of positron annihilation in metals are discussed. Application of the theory to the positron trapping process treatment allows us to overcome the discrepancies between theory and experiments which have been encountered till now.

Riassunto

Si presenta una teoria a molti corpi delle proprietà di correlazione di un singolo positone in un liquido di elettroni. Essa è basata sul formalismo a risposta lineare. Si ricavano approssimizioni esplicite e di tipo non perturbativo per l’autoenergia ed il potenziale chimico del positone. Il comportamento a quasi particella del positone è studiato in dettaglio. Si discutono alcune conseguenze delle correlazioni sull’annichilazione di positoni nei metalli. Si applica la teoria alla trattazione del processo di intrappolamento di positoni in vacanze metalliche, e si riescono a superare alcune difficoltà fino ad ora incontrate nella spiegazione dei dati sperimentali.

Резюме

Предлагается теория многих тел для исследования корреляционных свойств позитрона в электронной жидкости. Теория основывается на формализме линейного отклика. Приводятся явные непертурбационные приближенные выражения и численные результаты для собственной энергии позитрона и химического потенциала. Подробно исследуется квази-частичное поведение позитрона. Обсуждаются некоторые следствия корреляций в случае аннигиляции позитрона в металлах. Применение этой теории к рассмотрению процессов захвата позитронов позволяет преодолеть расхождения между теорией и экспериментами, котроые были проведены до сих пор.

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Authors and Affiliations

  1. Istituto di Fisica Teorica dell’Università, Catania

    M. Baldo & R. Pucci

  2. Istituto Nazionale di Fisica Nucleare, Sezione di Catania, Catania

    M. Baldo & R. Pucci

  3. Centro Siciliano di Fisica Nucleare e di Struttura della Materia, Catania

    M. Baldo & R. Pucci

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  1. M. Baldo
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  2. R. Pucci
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Baldo, M., Pucci, R. Correlation properties of a positron in an electron liquid. Theory and applications. Nuov Cim B 23, 202–225 (1974). https://doi.org/10.1007/BF02737505

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  • DOI: https://doi.org/10.1007/BF02737505

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