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DY: Fachverband Dynamik und Statistische Physik
DY 2: Statistical Physics (general)
DY 2.5: Talk
Monday, March 14, 2011, 11:15–11:30, ZEU 255
Non-metal-to-metal transition driven by van der Waals forces in an interacting polaronic gas — •Pascal Quémerais1,2 and Gennady N. Chuev3,4 — 1Institut Néel, CNRS-UJF, Grenoble, France — 2Max-Planck-Institute for Physics of Complex Systems, Dresden, Germany — 3Russian Academy of Science, Pushchino, Moscow Region, Russia — 4Max-Planck-Institute for Mathematics in the Sciences, Leipzig, Germany
We develop a model treating non-degenerate Fröhlich polarons with long-range Coulomb interactions at low densities and temperatures. Starting from the dilute regime, we show that at strong electron-phonon coupling, the collective properties of polarons are mainly governed by dipolar interactions in the crystallized state (Polaron Wigner Crystal) at zero temperature. At larger temperature in the liquid state, the dipolar interactions corresponds to the London dispersion forces, i.e. induced dipole-dipole van der Waals interactions. At a critical density, these forces provoke a non-metal to-metal transition by means of a polarization catastrophe which results in a polaron dissociation. The 3D and 2D case will be discussed as well as possible applications to real systems (metal-ammonia solutions, high-Tc cuprates).
[1] G.N. Chuev, P. Quémerais J. Chem. Phys. 127,244501 (2007)
[2] G.N. Chuev, P. Quémerais J. Chem. Phys. 128, 144503 (2008)
[3] P. Quémerais, G.N. Chuev, New Jour. Phys. 12 023030 (2010)