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We report on the observation of a dc Stark frequency shift at the 10<sup>-13</sup> level by comparing two strontium optical lattice clocks. This frequency shift arises from the presence of electric charges trapped on dielectric surfaces placed under vacuum close to the atomic sample. We show that these charges can be eliminated by shining UV light on the dielectric surfaces, and characterize the residual dc Stark frequency shift on the clock transition at the 10<sup>-18</sup> level by applying an external electric field. This study shows that the dc Stark shift can play an important role in the accuracy budget of lattice clocks, and should be duly taken into account.

Observation and cancellation of a perturbing dc stark shift in strontium optical lattice clocks