Exciton-exciton interaction and biexciton formation in bilayer systems

Details Exciton-exciton interaction and biexciton formation in bilayer systems Exciton-exciton interaction and biexciton formation in bilayer systems

2008-11-20

arxiv.org/abs/0811.3318v1

Phys. Rev. B 79, 125308 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 11 figures, 2 tables

Scientific paper

10.1103/PhysRevB.79.125308

We report quantum Monte Carlo calculations of biexciton binding energies in ideal two-dimensional bilayer systems with isotropic electron and hole masses. We have also calculated exciton-exciton interaction potentials, and pair distribution functions for electrons and holes in bound biexcitons. Comparing our data with results obtained in a recent study using a model exciton-exciton potential [C. Schindler and R. Zimmermann, Phys. Rev. B \textbf{78}, 045313 (2008)], we find a somewhat larger range of layer separations at which biexcitons are stable. We find that individual excitons retain their identity in bound biexcitons for large layer separations.

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