  We study theoretically optomechanical interactions in a semiconductor
microcavity with embedded quantum well under the optical pumping by a Bessel
beam, carrying a non-zero orbital momentum. Due to the transfer of orbital
momentum from light to phonons, the microcavity can act as an acoustic
circulator: it rotates the propagation direction of the incident phonon by a
certain angle clockwise or anticlockwise. Due to the optomechanical heating and
cooling effects, the circulator can also function as an acoustic laser emitting
sound with nonzero angular momentum. Our calculations demonstrate the potential
of semiconductor microcavities for compact integrable optomechanical devices.
