Interaction-assisted propagation of Coulomb-correlated electron-hole pairs in disordered semiconductors

A two-band model of a disordered semiconductor is used to analyze dynamical interaction induced weakening of localization in a system that is accessible to experimental verification. The results show a dependence on the sign of the two-particle interaction and on the optical excitation energy of the Coulomb-correlated electron-hole pair.Comment: 4 pages and 3 ps figure

The construction of cubic and quartic planar maps with prescribed face degrees

AbstractIn this paper, the existence and availability of computer programs to constructively enumerate all simple connected cubic or quartic planar maps with prescribed number of vertices and face degrees is announced and results of the programs are presented. The underlying algorithms of the computer programs are described