Impurity induced bound states and proximity effect in a bilayer exciton condensate

Details Impurity induced bound states and proximity effect in a bilayer exciton condensate Impurity induced bound states and proximity effect in a bilayer exciton condensate

2009-12-16

arxiv.org/abs/0912.3201v1

Phys. Rev. Lett.104, 166802 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures

Scientific paper

The effect of impurities which induce local interlayer tunneling in bilayer exciton condensates is discussed. We show that a localized single fermion bound state emerges inside the gap for any strength of impurity scattering and calculate the dependence of the impurity state energy and wave function on the potential strength. We show that such an impurity induced single fermion state enhances the interlayer coherence around it, and is similar to the superconducting proximity effect. As a direct consequence of these single impurity states, we predict that a finite concentration of such impurities will increase the critical temperature for exciton condensation.

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