Controllable optical bistability with perfect photon absorption

We propose a scheme for controlling nonlinear coherent perfect absorption (CPA) in three-level \Lambda-type atom-cavity system. Generally, the normally CPA and bistable can be attained at different frequencies of an input probe field. With control field coupling one ground states excited state atoms, two types same frequency. Besides, CPA, highest output-input ratio high stable low is approximately 1, region controllable with The may have potential applications optical switching logic devices