XXIX Symposium "Nanophysics and Nanoelectronics", Nizhny Novgorod, March 10-14, 2025

Inhomogeneous broadening of energy levels due to fluctuations of doping concentration in quantum-cascade lasers

An. A. Afonenko^a, A. A. Afonenko^a, D. V. Ushakov^a, R. A. Khabibullin<sup>b

a</sup> Belarusian State University, Minsk
^b National Research Centre "Kurchatov Institute", Moscow

Abstract: The influence of fluctuations of the concentration of charged impurities on the current-voltage characteristics of quantum-cascade lasers at the coherence length of electron wave functions exceeding the screening length of the Coulomb potential is analyzed. It is found that the value of inhomogeneous broadening of the transition lines can exceed the values for the homogeneous broadening for the corresponding levels. The value of inhomogeneous broadening appears to be larger for the wave functions, which are more separated in space.

Received: 26.03.2025
Revised: 23.06.2025
Accepted: 23.06.2025

DOI: 10.61011/FTP.2025.02.60980.7737