Sunday, August 4, 2013

1308.0280 (D. Neilson et al.)

Excitonic Superfluidity and Screening in Electron-Hole Bilayer Systems    [PDF]

D. Neilson, A. Perali, A. R. Hamilton
We address the controversy on the effectiveness of screening and the importance of vertex corrections in the long range interactions that generate superfluid pairing in electron-hole bilayer systems in graphene and GaAs. We assess proposed mean-field approximations that treat screening very differently and which neglect vertex corrections, by comparing their predictions for the superfluid condensate fraction with recent Diffusion Quantum Monte Carlo results. We find that screening in the superfluid state is the best mean-field approximation and that vertex corrections are negligible.
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