Room temperature electron spin coherence in telecom-wavelength quaternary quantum wells

TL;DR

This study demonstrates room temperature electron spin coherence in telecom-wavelength AlInGaAs quantum wells, with coherence times around 100 ps, varying g-factors, and potential for quantum information applications.

Contribution

It provides the first measurement of room temperature electron spin coherence times in telecom-wavelength quantum wells with detailed g-factor analysis.

Findings

Electron spin coherence times reach ~100 ps at room temperature.

Effective g-factors vary from -2.3 to -1.1 depending on composition.

Spin dynamics depend on aluminum concentration in quantum wells.

Abstract

Time-resolved Kerr rotation spectroscopy is used to monitor the room temperature electron spin dynamics of optical telecommunication wavelength AlInGaAs multiple quantum wells lattice-matched to InP. We found that electron spin coherence times and effective g-factors vary as a function of aluminum concentration. The measured electron spin coherence times of these multiple quantum wells, with wavelengths ranging from 1.26 microns to 1.53 microns, reach approximately 100 ps at room temperature, and the measured electron effective g-factors are in the range from -2.3 to -1.1.