GEOMETRICAL PHASE FOR PHONONS

Authors
WALKER MB ZAK J
Citation
Mb. Walker et J. Zak, GEOMETRICAL PHASE FOR PHONONS, Europhysics letters, 26(7), 1994, pp. 481-486
Citations number
20
Categorie Soggetti
Physics
Journal title
Europhysics letters → ACNP
ISSN journal
02955075
Volume
26
Issue
7
Year of publication
1994
Pages
481 - 486
Database
ISI
SICI code
0295-5075(1994)26:7<481:GPFP>2.0.ZU;2-C
Abstract
The Berry geometrical phase is calculated for lattice vibrations in a one-dimensional two-atom unit cell. The phase difference of the optica l and acoustic branches in a molecular crystal is shown to be zero, an d in a ionic crystal it is pi.