Voltage-controlled optical bistability of a tunable three-level system in a quantum-dot molecule

We investigate the behavior of optical bistability (OB) in an asymmetry semiconductor double quantum dot (QD) using the tunnel coupling. Such a tunable three-level QD system is driven coherently by a laser field inside the unidirectional ring cavity. The results show that we are able to control efficiently the bistable threshold intensity and the hysteresis loop by tuning the parameters of the system such as the gate voltage and laser frequency. The results obtained can be used for the development of new types of nanoelectronic devices for realizing switching process. (C) 2008 Elsevier B.V. All rights reserved.