Analog of the Auger effect in radiative decay of a trion in a quantum well

TL;DR

This paper investigates the radiative decay of trions in quantum wells, revealing a linear increase in trion binding energy with Fermi level shifts, aligning with experimental photoluminescence data.

Contribution

It demonstrates, for the first time, how the trion binding energy varies linearly with Fermi level shifts in quantum wells, connecting theory with experimental observations.

Findings

Trion binding energy increases linearly with Fermi level shift.

Theoretical analysis agrees with experimental photoluminescence data.

Provides insight into the energetics of trion decay in quantum wells.

Abstract

We have analyzed the energetics of decay of the X^- trion (exciton + electron) on the assumption that the exciton and trion are independent excitations of a single two-dimensional semiconducting quantum well. For the first time, it has been shown that in filling a well with electrons from a selective donor-doped matrix, the binding energy of the trion (of the electron with the exciton) increases linearly with a shift of the Fermi level into the depth of the c band. This agrees with the well-known experimental data on the low-temperature radiative decay (photoluminescence) of trions in the heterostructures ZnSe/Zn_0.89Mg_0.11S_0.18Se_0.82 and CdTe/Cd_0.7Mg_0.3Te.