INFRARED INTERSUBBAND TRANSITIONS IN DOUBLE-QUANTUM WELLS UNDER THE ELECTRIC-FIELD

The possibility of observation of four peak absorption caused by transitions between the pairs of ground and the first excited tunnel-coupled states in double-quantum wells (DQWs) is studied. Comparison of ordinary and differential absorption spectra for different biases is carried out. It is shown that use of differential absorption spectra is very useful for investigation of IR transitions of electrons in DQWs (sensitivity of such measurements may turn out to be sufficient for IR investigation of even single DQWs in contrast to usual experiments that should be performed multi-DQWs structures). © 1995 American Institute of Physics.