T. Hakioğlu, Ege Özgün, Mehmet Günay
We predict three measurable free energy related signatures of the condensed excitons in DQWs and propose experiments for their measurements. The first two are related to the static as well as dynamical measurements of the attractive critical Casimir force in the DQW geometry arising due to the presence of a sharp phase boundary defined by the critical coupling constant (i.e. the layer separation), the temperature, the exciton number and the electron-hole number imbalance. We also propose, in a somewhat similar geometry, a third experiment that distinguishes electrostatically the dependence of the free energy on the exciton concentration between a free exciton gas and an exciton condensate. The proposed experiments are regarded as highly conclusive on the presence of the exciton condensate, with a result irrespective from the relative strengths of the dark/bright components, a clear diffculty in understanding the nature of the condensed excitonic ground state.
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http://arxiv.org/abs/1210.4687
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