Effective Interactions in Systems of Active Particles

Systems of linearly-driven active particles have been shown to exhibit fluid-solid coexistence in experiments and simulations. Still, the behavior of these and rotationally-driven anisotropic particles remains open for exploration. In this talk, we show that the addition of a constant driving torque for each particle to form an active system has a nonlinear effect on emergent forces between particles, which can be tuned to be attractive or repulsive. Effective interactions due to activity are naturally switchable and give us a new, orthogonal design dimension for assembly engineering in addition to more traditional design variables such as particle shape and enthalpic patchiness.