Polarization fluctuations in insulators and metals: New and old theories merge (Articolo in rivista)

Type
Label
  • Polarization fluctuations in insulators and metals: New and old theories merge (Articolo in rivista) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevLett.96.137601 (literal)
Alternative label
  • Resta, R (2006)
    Polarization fluctuations in insulators and metals: New and old theories merge
    in Physical review letters (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Resta, R (literal)
Pagina inizio
  • 137601-1 (literal)
Pagina fine
  • 137601-4 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://prl.aps.org/pdf/PRL/v96/i13/e137601 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 96 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 13 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • INFM, DEMOCRITOS Natl Simulat Ctr, I-34014 Trieste, Italy; Univ Trieste, Dipartimento Fis Teor, I-34014 Trieste, Italy (literal)
Titolo
  • Polarization fluctuations in insulators and metals: New and old theories merge (literal)
Abstract
  • The ground-state fluctuation of polarization P is finite in insulators and divergent in metals, owing to the SWM sum rule [I. Souza, T. Wilkens, and R. M. Martin, Phys. Rev. B 62, 1666 (2000)]. This is a virtue of periodic (i.e., transverse) boundary conditions. I show that within any other boundary conditions the P fluctuation is finite even in metals, and a generalized sum rule applies. The boundary-condition dependence is a pure correlation effect, not present at the independent-particle level. In the longitudinal case del center dot P=-rho, and one equivalently addresses charge fluctuations: the generalized sum rule reduces then to a well-known result of the many-body theory. (literal)
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