Giant current density via indirect exciton orbit overlapping in polarized nano-granular materials

Abstract

Anomalous charge transport in closely packed 2-4 nm-diameter metal nanocrystals is modeled using a cluster of indirect excitons produced among polarized metal particles. The conductivity originates from charge transfer via overlapping orbits among adjacent particles, and electron-hole liquid is expected from predicted high densities of electrons and holes, allowing a giant current carrying capacity. The Bose-Hubbard phase diagram and an inter-exciton distance shorter than the de Broglie wavelength suggests the possibility of a electron-hole Bardeen-Cooper-Schrieffer-like condensate, where a net current flow can be attributed to the annihilation of electron-hole pairs.