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Polarization fluctuations in insulators and metals: New and old theories merge (Articolo in rivista)
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- 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)
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- http://prl.aps.org/pdf/PRL/v96/i13/e137601 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
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- 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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