Volume 34, Number 2, April II 1996
|Page(s)||127 - 132|
|Section||Condensed matter: structure, thermal and mechanical properties|
|Published online||01 September 2002|
Exact numerical diagonalization of one-dimensional interacting electrons non-adiabatically coupled to phonons
Dipartimento di Chimica Generale ed Inorganica, Chimica Analitica
e Chimica Fisica, Università di Parma - 43100 Parma, Italy
2 Bayreuther Institut für Makromolekülforschung (BIMF) and Theoretische Physik 1, Universität Bayreuth - D-95440 Bayreuth, Germany (Present Address.)
3 Institut Laue-Langevin - BP 156, F-38042 Grenoble, France
Accepted: 26 February 1996
We study the role of non-adiabatic Holstein electron-phonon coupling on the neutral-ionic phase transition of charge transfer crystals which can be tuned from continuous to discontinuous, using exact numerical diagonalization. The variation of electronic properties through the transition is smoothed by non-adiabaticity. Lattice properties are strongly affected, and we observe both squeezing and antisqueezing, depending on details of the adiabatic potentials, and identify the quantum uncertainty of the phonons as the most sensitive measure of non-adiabaticity. The adiabatic limit is regular for a continuous transition but turns out completely inadequate near a discontinuous transition. The relevance of coherent-state approaches is assessed critically.
PACS: 63.20.Kr – Phonon-electron interactions / 71.20.Ad – Developments in mathematical and computational techniques / 71.27.+a – Strongly correlated electron systems
© EDP Sciences, 1996
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.