2008/10/02 by S. Ciuchi, S. Fratini · 1 citation
Engineering · Materials Science · Physics and Astronomy · #Chemical physics #Condensed matter physics #Coulomb #Decoupling (probability) #Dielectric #Electronic and Structural Properties of Oxides #Materials science #Physics #Polarizability #Polaron #Quantum and electron transport phenomena #Quantum mechanics #Semiconductor materials and devices #Statistical physics #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.79.035113
published as Phys. Rev. B 79, 035113 (2009)
arxiv created 2008/10/02 · openalex publication_date 2009/01/16 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We derive an effective cluster model to address the transport properties of mutually interacting small polarons. We propose a decoupling scheme where the hopping dynamics of any given particle is determined by separating out explicitly the degrees of freedom of its environment, which are treated as a statistical bath. The general cavity method developed here shows that the long-range Coulomb repulsion between the carriers leads to a net increase in the thermal activation barrier for electrical transport and hence to a sizable reduction in the carrier mobility. A mean-field calculation of this effect is provided based on the known correlation functions of the interacting liquid in two and three dimensions. The present theory gives a natural explanation of recent experiments performed in organic field-effect transistors with highly polarizable gate dielectrics and might well find application in other classes of polaronic systems such as doped transition-metal oxides.