Biexcitons in two-dimensional systems with spatially separated electrons and holes

Details Biexcitons in two-dimensional systems with spatially separated electrons and holes Biexcitons in two-dimensional systems with spatially separated electrons and holes

2008-08-14

arxiv.org/abs/0808.2067v1

Phys. Rev. B 78, 235307 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

11 pages, 7 figures

Scientific paper

10.1103/PhysRevB.78.235307

The binding energy and wavefunctions of two-dimensional indirect biexcitons are studied analytically and numerically. It is proven that stable biexcitons exist only when the distance between electron and hole layers is smaller than a certain critical threshold. Numerical results for the biexciton binding energies are obtained using the stochastic variational method and compared with the analytical asymptotics. The threshold interlayer separation and its uncertainty are estimated. The results are compared with those obtained by other techniques, in particular, the diffusion Monte-Carlo method and the Born-Oppenheimer approximation.

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