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We simulate a colloidal particle (radius R) in a cholesteric liquid crystal(pitch p) with tangential order parameter alignment at the particle surface.The local defect structure evolves from a dipolar pair of surface defects(boojums) at small R/p to a pair of twisted disclination lines wrapping aroundthe particle at larger values. On dragging the colloid with small velocity vthrough the medium along the cholesteric helix axis (an active microrheologymeasurement), we find a hydrodynamic drag force that scales linearly with v butsuperlinearly with R-in striking violation of Stokes' law, as generally used tointerpret such measurements.

Colloids in Cholesterics: Size-Dependent Defects and Non-Stokesian Microrheology