Screening of positrons in semiconductors and insulators

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en Puska, M. J. Mäkinen, S. Manninen, Matti Nieminen, Risto 2018-05-22T14:40:38Z 2018-05-22T14:40:38Z 1989-04-15
dc.identifier.citation Puska , M J , Mäkinen , S , Manninen , M & Nieminen , R 1989 , ' Screening of positrons in semiconductors and insulators ' Physical Review B , vol 39 , no. 11 , pp. 7666-7679 . DOI: 10.1103/PhysRevB.39.7666 en
dc.identifier.issn 0163-1829
dc.identifier.issn 1550-235X
dc.identifier.other PURE UUID: 7cf62aa9-f4c1-4b37-953f-c27bce5e89b2
dc.identifier.other PURE ITEMURL:
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dc.description.abstract Theoretical models are presented for the enhancement of the electron density at a positron in a semiconductor or insulator host. The model better suited for typical semiconductors is based on the many-body theory for the screening of a positron in electron gas. The starting point of the model for insulators is the atomic polarizability. The common parameter in both models is the high-frequency dielectric constant. Moreover, the enhancement depends on the ambient electron density in the semiconductor model and on the unit-cell volume in the insulator model. With use of the models developed, positron lifetimes in perfect semiconductor and insulator crystals have been calculated. In the calculations, three-dimensional electron densities and electrostatic potentials are obtained by atomic superposition and the fully three-dimensional positron wave functions are solved by a relaxation method. The calculated positron lifetimes agree with the experimental ones within a few picoseconds. Moreover, we have used the model to predict lifetimes of positrons trapped by lattice defects such as vacancies and vacancy clusters. en
dc.format.extent 14
dc.format.extent 7666-7679
dc.format.mimetype application/pdf
dc.language.iso en en
dc.relation.ispartofseries Physical Review B en
dc.relation.ispartofseries Volume 39, issue 11 en
dc.rights openAccess en
dc.subject.other Condensed Matter Physics en
dc.title Screening of positrons in semiconductors and insulators en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department University of Jyväskylä
dc.contributor.department Department of Applied Physics
dc.subject.keyword Condensed Matter Physics
dc.identifier.urn URN:NBN:fi:aalto-201805222444
dc.identifier.doi 10.1103/PhysRevB.39.7666
dc.type.version publishedVersion

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