Optical absorption of one-particle electron states in quasi-zero-dimensional nanogeterostructures: Theory

The paper is devoted to the theory for the interaction of an electromagnetic field with one-particle quantum-confined states of charge carriers in semiconductor quantum dots. It is demonstrated that the oscillator strengths and dipole moments of the transitions for one-particle states in quantum dots are large parameters, exceeding the corresponding typical parameters for bulk semiconductor materials. In the context of the dipole approximation, it is demonstrated that the large optical absorption cross sections in the quasi-zero-dimensional systems enable the use of such systems as efficient absorbing materials.