Carrier-density effects in many-polaron systems

Details Carrier-density effects in many-polaron systems Carrier-density effects in many-polaron systems

2006-09-12

arxiv.org/abs/cond-mat/0609296v2

J. Phys.: Condens. Matter 19, 255210 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

13 pages, 6 figures, accepted for publication in J. Phys.: Condens. Matter; final version

Scientific paper

10.1088/0953-8984/19/25/255202

Many-polaron systems with finite charge-carrier density are often encountered experimentally. However, until recently, no satisfactory theoretical description of these systems was available even in the framework of simple models such as the one-dimensional spinless Holstein model considered here. In this work, previous results obtained using numerical as well as analytical approaches are reviewed from a unified perspective, focussing on spectral properties which reveal the nature of the quasiparticles in the system. In the adiabatic regime and for intermediate electron-phonon coupling, a carrier-density driven crossover from a polaronic to a rather metallic system takes place. Further insight into the effects due to changes in density is gained by calculating the phonon spectral function, and the fermion-fermion and fermion-lattice correlation functions. Finally, we provide strong evidence against the possibility of phase separation.

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