Peierls distortion

https://doi.org/10.1351/goldbook.PT07442
Distortion of a regular one-dimensional structure with a partially occupied band to give bond alternation, eventually leading to @[email protected] or @[email protected] The degree of @[email protected], \(\lambda \) depends on the electronic population of the @[email protected] indicated by the wave vector of the @[email protected] \(k_{\mathrm{F}}\) \[\lambda = 2\ \pi /k_{\mathrm{F}}\]
Note:
A Peierls distortion opens a gap at the @[email protected], producing a net stabilization of the distorted structure. The Peierls distortion for chain compounds is analogous to the @[email protected] for molecules. The prototypical example of the Peierls distortion in organic chemistry is the bond alternation present in polyvinylene.
PT07442.png
Source:
PAC, 2007, 79, 293. (Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)) on page 381 [Terms] [Paper]