Phase-controlled bistability of a dark soliton train in a polariton   fluid
  We use a one-dimensional polariton fluid in a semiconductor microcavity to explore the rich nonlinear dynamics of counter-propagating interacting Bose fluids. The intrinsically driven-dissipative nature of the polariton fluid allows to use resonant pumping to impose a phase twist across the fluid. When the polariton-polariton interaction energy becomes comparable to their kinetic energy, linear interference fringes transform into a train of solitons. A novel type of bistable behavior controlled by the phase twist across the fluid is experimentally evidenced. 
Valentin Goblot, Hai Son Nguyen, Iacopo Carusotto, Elisabeth Galopin,   Aristide Lema\^itre, Isabelle Sagnes, Alberto Amo, J...
cond-mat.mes-hall cond-mat.quant-gas physics.optics