Relaxation Oscillations in the Formation of a Polariton Condensate
  We report observation of oscillations in the dynamics of a microcavity polariton condensate formed under pulsed non resonant excitation. While oscillations in a condensate have always been attributed to Josephson mechanisms due to a chemical potential unbalance, here we show that under some localisation conditions of the condensate, they may arise from relaxation oscillations, a pervasive classical dynamics that repeatedly provokes the sudden decay of a reservoir, shutting off relaxation as the reservoir is replenished. Using non-resonant excitation, it is thus possible to obtain condensate injection pulses with a record frequency of 0:1 THz. 
Milena De Giorgi, Dario Ballarini, Paolo Cazzato, George Deligeorgis,   Simos I. Tsintzos, Zacharias Hatzopoulos, Pavlos G. ...
cond-mat.mes-hall