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Dielectric Polarization of Materials: A Modern View

Published online by Cambridge University Press:  21 March 2011

Raffaele Resta
Raffaele Resta*
Affiliation:
Istituto Nazionale di Fisica della Materia (INFM) and Dipartimento di Fisica Teorica, Universitá di Trieste, I-34014 Trieste, Italy; Max-Planck-Institut für Festkörperforschung, D-70506 Stuttgart, Germany
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Abstract

The concept of macroscopic polarization is the basic one in the electrostatics of dielectric materials: but for many years this concept has evaded even a precise microscopic definition, and has severely challenged quantum-mechanical calculations. This concept has undergone a genuine revolution in recent years (1992 onwards). It is now pretty clear that—contrary to a widespread incorrect belief—macroscopic polarization has nothing to do with the periodic charge distribution of the polarized crystal: the former is essentially a property of the phase of the electronic wavefunction, while the latter is a property of its modulus. An outline of the modern viewpoint is presented. Experiments invariably address polarization derivatives (permittivity, piezoelectricity, pyroelectricity,…) or polarization differences (ferroelectricity), and these differences are measured as an integrated electrical current. The modern theory addresses this same current, which is dominated by the phase of the electronic wavefunctions. First-principle calculations based on this theory are in spectacular agreement with experiments, and provide thorough understanding of the behavior of dielectric materials.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 677: Symposium AA – Advances in Materials Theory and Modeling–Bridging Over Multiple-Length and Time Scales , 2001 , AA6.1
Copyright
Copyright © Materials Research Society 2001

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