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New free energy related signatures of the condensed excitons in DoubleQuantum Wells (DQW) are predicted and experiments are proposed to measure theeffects. These signatures are related to the measurement of a conceptually newkind of force ($\approx 10^{-9} N$) due to the condensate. This force, whichmay be coined as the Exciton Condensate (EC)-force is attractive andreminiscent of the Casimir force between two perfect metallic plates, but alsodistinctively different from it by its driving mechanism and dependence on theparameters of the condensate. The proposed experiments here are based on arecent experimental work on a driven micromechanical oscillator with a provenhigh quality factor. The free energy related measurements are immune to thecommonly agreed drawbacks of the existing photoluminescence experiments. Inthis regard, the proposed experiments are highly decisive about the EC.

A Measurable Force driven by an Excitonic Condensate in DQWs