File Name : si_fig_attraction.pdf Caption : (a)-(c)pear-shaped particles ($8\times10\,\mu\rm{m}^2$) embedded in a lc {\modif with positive dielectric anisotropy (5cb) and} driven by an in-plane ac field of frequency 10 hz and amplitude 0.1 v/$\mu$m (horizontal in the snapshots). the scale bar is $50 \mu$m.