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Exciton-exciton interaction and biexciton formation in bilayer systems

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Article number125308
<mark>Journal publication date</mark>12/03/2009
<mark>Journal</mark>Physical Review B
Issue number12
Number of pages6
<mark>Original language</mark>English


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.

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© 2009 The American Physical Society