1.
Phys Rev Lett
; 87(5): 052501, 2001 Jul 30.
Artículo
en Inglés
| MEDLINE
| ID: mdl-11497763
RESUMEN
Within the impulse approximation, the response of a many-body system at large momentum transfer can be directly related to ground state properties. Although the physics assumptions underlying impulse approximation are well defined, their implementation involves ambiguities that may cause significant differences in the calculated responses. We show that, while minimal use of the impulse approximation assumptions naturally leads to write the response in terms of the spectral function, the alternative definition in terms of the momentum distribution involves a more extended use of the same assumptions.
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Phys Rev B Condens Matter
; 54(14): 10035-10045, 1996 Oct 01.
Artículo
en Inglés
| MEDLINE
| ID: mdl-9984741
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Phys Rev B Condens Matter
; 50(6): 4248-4251, 1994 Aug 01.
Artículo
en Inglés
| MEDLINE
| ID: mdl-9976721
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Phys Rev B Condens Matter
; 39(4): 2700-2702, 1989 Feb 01.
Artículo
en Inglés
| MEDLINE
| ID: mdl-9948520
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Phys Rev B Condens Matter
; 33(9): 6057-6067, 1986 May 01.
Artículo
en Inglés
| MEDLINE
| ID: mdl-9939154