Abstract
A variational approach is used to investigate consequences of electron-phonon interactions between a charge carrier and multiple (specifically two) phonon branches. Phase diagrams are obtained and the nature of the transition from undressed to dressed phases of the carrier is studied with their help. No sharp transition between singly dressed and doubly dressed phases occurs. The effective carrier bandwidth, reduced by strong coupling to the high-frequency branch is found to be stable with respect to small to intermediate values of additional coupling to the low-frequency branch. This finding lends support to transport calculations based on the idea that carriers in a polaron band are dressed by one phonon mode and scattered by another.
Recommended Citation
V. M. Kenkre and P. E. Parris, "Variational Considerations in the Study of Carrier Transport in Organic Crystals," Physical Review B: Condensed Matter and Materials Physics, American Physical Society (APS), Jan 2004.
The definitive version is available at https://doi.org/10.1103/PhysRevB.70.064304
Department(s)
Physics
Sponsor(s)
National Science Foundation (U.S.)
Keywords and Phrases
Electron-phonon interactions
Document Type
Article - Journal
Document Version
Final Version
File Type
text
Language(s)
English
Rights
© 2004 American Physical Society (APS), All rights reserved.
Publication Date
01 Jan 2004
