  Controlled transfer of orbital angular momentum to exciton-polariton
Bose-Einstein condensate spontaneously created under incoherent, off-resonant
excitation conditions is a long-standing challenge in the field of microcavity
polaritonics. We demonstrate, experimentally and theoretically, a simple and
efficient approach to generation of nontrivial orbital angular momentum states
by using optically-induced potentials -- chiral polaritonic lenses.
