Journal
SOLID STATE COMMUNICATIONS
Volume 149, Issue 45-46, Pages 2106-2109Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ssc.2009.08.009
Keywords
Electron-phonon interactions; Phonons; Electronic states (localized); Tunnelling
Categories
Funding
- National Basic Research Program of China [2009CB929104]
- Zhejiang Provincial Natural Science Foundation [Z7080203]
- Program for Innovative Research Team in Zhejiang Normal University
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We study the polaronic crossover properties in the two-site Holstein model by the quantum entanglement and the fidelity. Based on the exact wave function obtained by the extended bosonic coherent states, the linear entropy and the fidelity are evaluated. The maximum of the entanglement between the electron and surrounding phonons is observed in a small polaron regime. A smooth change (no singularity) of the ground-state fidelity as well as its susceptibility appears in the intermediate coupling regime, which confirms a crossover rather than a phase transition in this system by this quantum information tool. In addition, the results for some quantities in the weak-coupling and strong-coupling limit are given analytically. (C) 2009 Elsevier Ltd. All rights reserved.
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