The local state of a deep impurity in the parabolic quantum well is studied in the framework of the zero-potential model. It is shown that the position disorder effect exists in quantums wells that are narrow enough: the binding energy of the deep center is a diminishing function of the transverse coordinate of this center. It is found that the position disorder effect gain takes place when passing from the rectangular potential well of a finite depth to the parabolic potential well. The spectral dependence of the cross-section of photoionization of deep impurity centers is studied. It is shown that the cross-section of photoionization is a non-monotonic spectral function, and the absorption threshold depends heavily on the deep impurity center coordinate and parameters of the quantum well.
7 Физика и техника полупроводников, 2000, том 34, вып.