%0 Journal Article %T Glass transitions in two-dimensional suspensions of colloidal ellipsoids %A Zhongyu Zheng %A Feng Wang %A Yilong Han %J Physics %D 2011 %I arXiv %R 10.1103/PhysRevLett.107.065702 %X We observed a two-step glass transition in monolayers of colloidal ellipsoids by video microscopy. The glass transition in the rotational degree of freedom was at a lower density than that in the translational degree of freedom. Between the two transitions, ellipsoids formed an orientational glass. Approaching the respective glass transitions, the rotational and translational fastest-moving particles in the supercooled liquid moved cooperatively and formed clusters with power-law size distributions. The mean cluster sizes diverge in power law as approaching the glass transitions. The clusters of translational and rotational fastest-moving ellipsoids formed mainly within pseudo-nematic domains, and around the domain boundaries, respectively. %U http://arxiv.org/abs/1105.5760v1