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External gradients can strongly influence the collective behavior ofmicroswimmers. In this paper, we study the behavior of two hydrodynamicallyinteracting self-propelled chiral swimmers, in the low-Reynolds number regime,under the influence of an external linear chemical gradient. We use thegeneralized squirmer model called the chiral squirmer, a spherically shapedbody with an asymmetric surface slip velocity, to represent the swimmer. Wefind that the external gradient favors the attraction between the swimmers and,in some situations, leads to a bounded state in which the swimmers move in ahighly synchronous manner. Further, due to this cooperative motion, swimmersefficiently reach the chemical target compared to the individual swimmers. Thisstudy may help to understand the collective behavior of chiral swimmers and todesign synthetic microswimmers for targeted drug delivery.

External chemical gradient leads to efficient swimming of chiral swimmers