Ref HAL: hal-00285067_v1
Ref Arxiv: 0804.2675
DOI: 10.1103/PhysRevB.77.205109
WoS: 000256971800026
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
27 Citations
Résumé:

The Optimized Perturbation Theory (OPT) method, at finite temperature and finite chemical potential, is applied to the field theory model for polyacetylene. The critical dopant concentration in trans-polyacetylene is evaluated and compared with the available experimental data and with previous calculations. The results obtained within the OPT go beyond the standard mean field (or large-N) approximation (MFA) by explicitly including finite N effects. A critical analysis of the possible theoretical prescriptions to implement and interpret these corrections to the mean field results, given the available data, is given. For typical temperatures probed in the laboratory, our results show that the critical dopant concentration is only weakly affected by thermal effects.