Lee, R. M. and Drummond, Neil and Needs, R. J. (2009) Exciton-exciton interaction and biexciton formation in bilayer systems. Physical review B, 79 (12): 125308. ISSN 1550-235X
Abstract
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 [ Schindler and Zimmermann Phys. Rev. B 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.