Simulations of the random barrier model show that ac currents at extreme disorder are carried almost entirely by the percolating cluster slightly above threshold; thus contributions from isolated low-activation-energy clusters are negligible. The effective medium approximation in conjunction with the Alexander-Orbach conjecture lead to an excellent analytical fit to the universal ac conductivit...

Exact results for the density of states and the ac conductivity of the spinless Holstein model at finite carrier density are obtained combining Lanczos and kernel polynomial methods.

Exceptional points, which are topological non-Hermitian degeneracies, show up in the collective mode spectrum of Fermi liquids with high angular momentum interactions. In this paper, we look for signatures these nontrivial singularities by computing AC conductivity dipolar and quadrupolar interactions a narrow slab. We that finite size slab imprints clear structures as well dephasing between el...

In the present work polymer electrolytes were formulated using solvent casting technique. Under special conditions, electrolyte content was of fixed ratio polyvinylpyrolidone (PVP): polyacrylonitrile (PAN) (25:75), ethylene carbonate (EC) and propylene (PC) (1:1) with 10% potassium iodide (KI) iodine I2 = by weight KI. The conductivity increased addition ZnO nanoparticles. It is also temperatur...