Carrier-density effects in many-polaron systems

Many-polaron systems with finite charge-carrier density are often encountered experimentally. However, until recently, no satisfactory theoretical description of these systems has been available even in the framework of simple models such as the one-dimensional spinless Holstein model considered her...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2007-06, Vol.19 (25), p.255202-255202 (12)
Main Authors: Hohenadler, M, Hager, G, Wellein, G, Fehske, H
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electron states
Exact sciences and technology
Physics
Polarons and electron-phonon interactions
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Summary:Many-polaron systems with finite charge-carrier density are often encountered experimentally. However, until recently, no satisfactory theoretical description of these systems has been 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, focusing 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.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/19/25/255202