Ground state properties of multi-polaron systems
  We summarize our recent results on the ground state energy of multi-polaron systems. In particular, we discuss stability and existence of the thermodynamic limit, and we discuss the absence of binding in the case of large Coulomb repulsion and the corresponding binding-unbinding transition. We also consider the Pekar-Tomasevich approximation to the ground state energy and we study radial symmetry of the ground state density. 
Rupert L. Frank, Elliott H. Lieb, Robert Seiringer, Lawrence E. Thomas
math-ph cond-mat.str-el math.AP math.MP