Order-disorder oscillations in exciton-polariton superfluids
  The dynamics of an exciton-polariton superfluid resonantly pumped in a semiconductor microcavity are investigated by mean-field theory. Modulational instability develops into crystalline order and then ordered and disordered states alternately form. A supersolid-like state is also found, in which superflow coexists with crystalline order at rest. 
Hiroki Saito, Tomohiko Aioi, Tsuyoshi Kadokura
cond-mat.mes-hall cond-mat.quant-gas