J. Phys. IV France 09 (1999) Pr10-259-Pr10-261
Quantum and/or thermal melting of a polaron Wigner crystalS. Fratini and P. Quémerais
Laboratoire d'Études des Propriétés Électroniques des Solides, CNRS, PB. 166, 38042 Grenoble cedex 9, France
We study the properties of a lattice of large polarons at low density, which crystallize due to the long-range Coulomb repulsion. We analyze the insulator-to-metal transition occurring in the system as the density or the temperature increase, and propose a new transition mechanism based on polaron dissociation. Finally, an optical signature for such a mechanism is provided in the limit of strong electron-phonon coupling.
© EDP Sciences 1999