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Titolo:
DYNAMICAL-CHARGE NEUTRALITY AT A CRYSTAL-SURFACE
Autore:
RUINI A; RESTA R; BARONI S;
Indirizzi:
UNIV MODENA,DIPARTIMENTO FIS,VIA CAMPI 213-A I-41100 MODENA ITALY SCUOLA INT SUPER STUDI AVANZATI,INFM I-34014 TRIESTE ITALY UNIV TRIESTE,DIPARTIMENTO FIS TEOR,INFM I-34014 TRIESTE ITALY CTR EUROPEEN CALCUL ATOM & MOL F-69007 LYON FRANCE
Titolo Testata:
Physical review. B, Condensed matter
fascicolo: 10, volume: 57, anno: 1998,
pagine: 5742 - 5745
SICI:
0163-1829(1998)57:10<5742:DNAAC>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
PHONONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
18
Recensione:
Indirizzi per estratti:
Citazione:
A. Ruini et al., "DYNAMICAL-CHARGE NEUTRALITY AT A CRYSTAL-SURFACE", Physical review. B, Condensed matter, 57(10), 1998, pp. 5742-5745

Abstract

For both molecules and periodic solids, ionic dynamical charge tensors-measuring the coupling of electric fields to ionic displacements-areknown to obey a dynamical neutrality condition. This condition forcestheir sum to vanish over the whole finite system, or over the crystalcell, respectively. We extend this sum rule to the nontrivial case ofthe surface of a semi-infinite solid and show that, in the case of a polar surface of an insulator, the surface ions cannot have the same dynamical charges as in the bulk. The sum rule is demonstrated through calculations for a couple of SiC surfaces.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/07/20 alle ore 13:59:02