Plasmon model for image-potential-induced surface states with an application to positrons at metal surfaces
- 15 September 1978
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 18 (6) , 2568-2576
- https://doi.org/10.1103/physrevb.18.2568
Abstract
A variational method is presented to calculate dynamic corrections to the image potential of a charged particle at a metal-vacuum interface and hence to calculate its binding energy. The response of the metal is treated within the plasmon approximation. As an application, a model for positron surface states on simple metals is studied. It predicts the existence of bound positron surface states in Al, Ga, Zn, Cd, and possibly other high-density simple metals. Further, the resulting localized positron state would have a lifetime 2 to 3 times longer than in the bulk.Keywords
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