Conditions for Rotational Invariance of a Harmonic Lattice
- 11 November 1966
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 151 (2), 578-580
- https://doi.org/10.1103/physrev.151.578
Abstract
The conditions for rotational invariance of a Born—von Karman lattice model are re-examined. It is found that the Born—Huang conditions for rotational invariance are necessary but not sufficient. Some additional conditions are obtained which, together with the Born—Huang conditions, constitute a set of necessary and sufficient conditions.Keywords
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