Effect of electric current on optical response of viscous electron-hole plasma

TL;DR

This study investigates how the Hall voltage influences the photoluminescence in a dense electron-hole plasma laser within a GaAs channel, revealing effects of Coulomb drag and electric fields on emission spectra.

Contribution

It provides new insights into the impact of Hall voltage and Coulomb interactions on the optical response of viscous electron-hole plasmas in mesoscopic structures.

Findings

Hall current causes double photoluminescence lines from excitons and trions.

Absence of Hall current results in energy shifts due to Hall potential.

Coulomb drag significantly affects optical emission in dense plasmas.

Abstract

The influence of the Hall voltage on the photoluminescence of a dense hydrodynamic electron-hole plasma laser generated in a mesoscopic n-doped GaAs channel under intense laser excitation is studied. Laser excitation induces an interband current determined by the recombination of photogenerated electron-hole pairs. As a result, background electrons drifting under the influence of the Hall voltage form an effective Hall current. The Coulomb drag caused by the Hall current causes the accumulation of light holes, leading to the appearance of a double photoluminescence line formed by the recombination of excitons and trions. In contrast, in the absence of a Hall current, the shift in the photoluminescence energy associated with heavy holes occurs due to the electric field created by the Hall potential difference.