Statistics of energy spectra of a strongly disordered system of interacting electrons

Physics – Condensed Matter – Mesoscale and Nanoscale Physics

Scientific paper

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15 pages

Scientific paper

10.1088/0953-8984/11/3/017

Statistics of many particle energy levels of a finite two-dimensional system of interacting electrons is numerically studied. It is shown that the statistics of these levels undergoes a Poisson to Wigner crossover as the strength of the disorder is decreased. This transition occurs at a similar strength of disorder as the one-electron delocalization crossover in a finite 2d system and develops almost simultaneously at all energies. We interpret this crossover in terms of delocalization in the space of occupation numbers of strongly bound and compact electron-hole pairs (excitons).

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