Premium
Collective excitation of hydrogen‐bonded ferroelectrics
Author(s) -
Fischer Sighart F.
Publication year - 2009
Publication title -
international journal of quantum chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.484
H-Index - 105
eISSN - 1097-461X
pISSN - 0020-7608
DOI - 10.1002/qua.560010680
Subject(s) - random phase approximation , excitation , dipole , quantum tunnelling , quasiparticle , condensed matter physics , electric field , chemistry , term (time) , physics , atomic physics , quantum mechanics , superconductivity
In a random phase approximation the collective excitations are calculated over the whole temperature range. Starting from a quite general interaction between protons, it turns out that beside the well‐known dipole–dipole interactions a cooperative tunneling term is important, at least at low temperatures. The bandwidth of the excitations is discussed as a function of temperature. In the appendix formulas are given for the effect of an applied electric field.