Ultrafast phenomena in semiconductors vol:297-2 pages:25-28
Experimental results on dynamical breakdown of metastable centers in Al0.3Ga0.7As caused by fast ramped electric fields are presented. The electrical breakdown was found to begin abruptly above threshold field F-th=(1.71+/-0.34)x10(5) V/cm. Persistent conductivity after the breakdown was observed at low temperatures. The breakdown is explained by ionization of DX centers by hot carriers.