title: Collective dynamics in a binary mixture of hydrodynamically coupled microrotors.
abstract: We study, numerically, the collective dynamics of self-rotating nonaligning particles by considering a monolayer of spheres driven by constant clockwise or counterclockwise torques. We show that hydrodynamic interactions alter the emergence of large-scale dynamical patterns compared to those observed in dry systems. In dilute suspensions, the flow stirred by the rotors induces clustering of opposite-spin rotors, while at higher densities same-spin rotors phase separate. Above a critical rotor density, dynamic hexagonal crystals form. Our findings underscore the importance of inclusion of the many-body, long-range hydrodynamic interactions in predicting the phase behavior of active particles.
authors.affiliation: IBM T.J. Watson Research Center, Yorktown Heights, New York 10598, USA.|Division of Applied Mathematics, Brown University, Rhode Island 02912, USA.
authors.forename: Kyongmin
authors.initials: K
authors.lastname: Yeo
authors.affiliation: School of Engineering, Brown University, Rhode Island 02912, USA.
authors.forename: Enkeleida
authors.initials: E
authors.lastname: Lushi
authors.affiliation: School of Engineering, Brown University, Rhode Island 02912, USA.
authors.forename: Petia M
authors.initials: PM
authors.lastname: Vlahovska