Control over hysteresis curves and thresholds of optical bistability in different semiconductor double quantum wells
H R Hamedia), M R Mehmannavazb), Hadi Afsharic)
       
Schematics of (a) five-level system in K-type configuration, (b) four-level system in Y-type configuration, (c) four-level system in inverted-Y-type configuration SDQWs.